From 7fa2fdfc11a4971d9c3e3068b68c4cc56dd696cd Mon Sep 17 00:00:00 2001
From: tigerbot <seth.gibelyou@daplie.com>
Date: Mon, 24 Jul 2017 17:10:41 -0600
Subject: [PATCH] separated the code into different files

---
 accounts.js | 355 ++++++++++++++++++++++++++++++++++
 common.js   |  39 ++++
 grants.js   |  76 ++++++++
 jwks.js     | 109 +++++++++++
 rest.js     | 539 +---------------------------------------------------
 5 files changed, 582 insertions(+), 536 deletions(-)
 create mode 100644 accounts.js
 create mode 100644 common.js
 create mode 100644 grants.js
 create mode 100644 jwks.js

diff --git a/accounts.js b/accounts.js
new file mode 100644
index 0000000..5c2067d
--- /dev/null
+++ b/accounts.js
@@ -0,0 +1,355 @@
+'use strict';
+
+var crypto = require('crypo');
+var PromiseA = require('bluebird');
+var OpErr = PromiseA.OperationalError;
+
+function makeB64UrlSafe(b64) {
+  return b64.replace(/\+/g, '-').replace(/\//g, '_').replace(/=*$/, '');
+}
+
+function retrieveOtp(codeStore, codeId) {
+  return codeStore.get(codeId).then(function (code) {
+    if (!code) {
+      return null;
+    }
+
+    var expires = (new Date(code.expires)).valueOf();
+    if (!expires || Date.now() > expires) {
+      return codeStore.destroy(codeId).then(function () {
+        return null;
+      });
+    }
+
+    return code;
+  });
+}
+function validateOtp(codeStore, codeId, token) {
+  if (!codeId) {
+    return PromiseA.reject(new Error("Must provide authcode ID"));
+  }
+  if (!token) {
+    return PromiseA.reject(new Error("Must provide authcode code"));
+  }
+  return codeStore.get(codeId).then(function (code) {
+    if (!code) {
+      throw new OpErr('authcode specified does not exist or has expired');
+    }
+
+    return PromiseA.resolve().then(function () {
+      var attemptsLeft = 3 - (code.attempts && code.attempts.length || 0);
+      if (attemptsLeft <= 0) {
+        throw new OpErr('you have tried to authorize this code too many times');
+      }
+      if (code.code !== token) {
+        throw new OpErr('you have entered the code incorrectly. '+attemptsLeft+' attempts remaining');
+      }
+      // TODO: maybe impose a rate limit, although going fast doesn't help you break the
+      // system when you can only try 3 times total.
+    }).then(function () {
+      return codeStore.destroy(codeId).then(function () {
+        return code;
+      });
+    }, function (err) {
+      code.attempts = code.attempts || [];
+      code.attempts.unshift(new Date());
+
+      return codeStore.upsert(codeId, code).then(function () {
+        return PromiseA.reject(err);
+      }, function () {
+        return PromiseA.reject(err);
+      });
+    });
+  });
+}
+
+function getOrCreate(store, username) {
+  return store.IssuerOauth3OrgAccounts.get(username).then(function (account) {
+    if (account) {
+      return account;
+    }
+
+    account = {
+      username:  username,
+      accountId: makeB64UrlSafe(crypto.randomBytes(32).toString('base64')),
+    };
+    return store.IssuerOauth3OrgAccounts.create(username, account).then(function () {
+      // TODO: put sort sort of email notification to the server managers?
+      return account;
+    });
+  });
+}
+function getPrivKey(store, experienceId) {
+  return store.IssuerOauth3OrgPrivateKeys.get(experienceId).then(function (jwk) {
+    if (jwk) {
+      return jwk;
+    }
+
+    var keyPair = require('elliptic').ec('p256').genKeyPair();
+    jwk = {
+      kty: 'EC',
+      crv: 'P-256',
+      alg: 'ES256',
+      kid: experienceId,
+      x: makeB64UrlSafe(keyPair.getPublic().getX().toArrayLike(Buffer).toString('base64')),
+      y: makeB64UrlSafe(keyPair.getPublic().getY().toArrayLike(Buffer).toString('base64')),
+      d: makeB64UrlSafe(keyPair.getPrivate().toArrayLike(Buffer).toString('base64')),
+    };
+
+    return store.IssuerOauth3OrgPrivateKeys.upsert(experienceId, jwk).then(function () {
+      return jwk;
+    });
+  });
+}
+
+function timespan(duration, max) {
+  var timestamp = Math.floor(Date.now() / 1000);
+
+  if (!duration) {
+    return;
+  }
+  if (typeof duration === 'string') {
+    duration = Math.floor(require('ms')(duration) / 1000) || 0;
+  }
+  if (typeof duration !== 'number') {
+    return 0;
+  }
+  // Handle the case where the user gave us a timestamp instead of duration for the expiration.
+  // Also make the maximum explicitly defined expiration as one year.
+  if (duration > 31557600) {
+    if (duration > timestamp) {
+      return duration - timestamp;
+    } else {
+      return 31557600;
+    }
+  }
+
+  if (max && timestamp+duration > max) {
+    return max - timestamp;
+  }
+  return duration;
+}
+
+function create(app) {
+  var restful = {};
+
+  restful.sendOtp = function (req, res) {
+    var params = req.body;
+    var promise = PromiseA.resolve().then(function () {
+      if (!params || !params.username) {
+        throw new OpErr("must provide the email address as 'username' in the body");
+      }
+      if ((params.username_type && 'email' !== params.username_type) || !/@/.test(params.username)) {
+        throw new OpErr("only email one-time login codes are supported at this time");
+      }
+      params.username_type = 'email';
+
+      return req.getSiteStore();
+    }).then(function (store) {
+      var codeStore = store.IssuerOauth3OrgCodes;
+      var codeId = crypto.createHash('sha256').update(params.username_type+':'+params.username).digest('base64');
+      codeId = makeB64UrlSafe(codeId);
+
+      return retrieveOtp(codeStore, codeId).then(function (code) {
+        if (code) {
+          return code;
+        }
+
+        var token = '';
+        while (!/^\d{4}-\d{4}-\d{4}$/.test(token)) {
+          // Most of the number we can generate this was start with 1 (and no matter what can't
+          // start with 0), so we don't use the very first digit. Also basically all of the
+          // numbers are too big to accurately store in JS floats, so we limit the trailing 0's.
+          token = (parseInt(crypto.randomBytes(8).toString('hex'), 16)).toString()
+            .replace(/0+$/, '0').replace(/\d(\d{4})(\d{4})(\d{4}).*/, '$1-$2-$3');
+        }
+        code = {
+          id: codeId,
+          code: token,
+          expires: new Date(Date.now() + 20*60*1000),
+        };
+        return codeStore.upsert(codeId, code).then(function (){
+          return code;
+        });
+      });
+    }).then(function (code) {
+      var emailParams = {
+        to:      params.username,
+        from:    'login@daplie.com',   // opts.mailer.defaults.system
+        replyTo: 'hello@daplie.com',
+        subject: "Use " + code.code + " as your Login Code",  // message.Subject
+        text:    code.code + " is your Login Code."        // message['stripped-html']
+      };
+      emailParams['h:Reply-To'] = emailParams.replyTo;
+
+      return req.getSiteMailer().sendMailAsync(emailParams).then(function () {
+        return {
+          code_id: code.id,
+          expires: code.expires,
+          created: new Date(parseInt(code.createdAt, 10) || code.createdAt),
+        };
+      });
+    });
+
+    app.handlePromise(req, res, promise, '[issuer@oauth3.org] send one-time-password');
+  };
+
+  restful.createToken = function (req, res) {
+    var store;
+    var promise = req.getSiteStore().then(function (_store) {
+      store = _store;
+      if (!req.body || !req.body.grant_type) {
+        throw new OpErr("missing 'grant_type' from the body");
+      }
+
+      if (req.body.grant_type === 'password') {
+        restful.createToken.password(req);
+      }
+      if (req.body.grant_type === 'issuer_token') {
+        restful.createToken.issuerToken(req);
+      }
+      if (req.body.grant_type === 'refresh_token') {
+        restful.createToken.refreshToken(req);
+      }
+
+      throw new OpErr("unknown or un-implemented grant_type '"+req.body.grant_type+"'");
+    }).then(function (token_info) {
+      token_info.iss = req.experienceId;
+      if (!token_info.aud) {
+        throw new OpErr("missing required token field 'aud'");
+      }
+      if (!token_info.azp) {
+        throw new OpErr("missing required token field 'azp'");
+      }
+
+      if (token_info.iss === token_info.azp) {
+        // We don't have normal grants for the issuer, so we don't need to look the
+        // azpSub or the grants up in the database.
+        token_info.azpSub = token_info.sub;
+        token_info.scope = '';
+        return token_info;
+      }
+
+      var search = {};
+      ['sub', 'azp', 'azpSub'].forEach(function (key) {
+        if (token_info[key]) {
+          search[key] = token_info[key];
+        }
+      });
+      return store.IssuerOauth3OrgGrants.find(search).then(function (grants) {
+        if (!grants.length) {
+          throw new OpErr("'"+token_info.azp+"' not given any grants from '"+(token_info.sub || token_info.azpSub)+"'");
+        }
+        if (grants.length > 1) {
+          throw new Error("unexpected resource collision: too many relevant grants");
+        }
+        var grant = grants[0];
+        Object.keys(grant).forEach(function (key) {
+          token_info[key] = grant[key];
+        });
+        return token_info;
+      });
+    }).then(function (token_info) {
+      return getPrivKey(store, req.experienceId).then(function (jwk) {
+        var pem = require('jwk-to-pem')(jwk, { private: true });
+        var payload =  {
+          // standard
+          iss: token_info.iss,    // https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32#section-4.1.1
+          aud: token_info.aud,    // https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32#section-4.1.3
+          azp: token_info.azp,
+          sub: token_info.azpSub, // https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32#section-4.1.2
+          // extended
+          scp: token_info.scope,
+        };
+        var opts = {
+          algorithm: jwk.alg,
+          header: {
+            kid: jwk.kid
+          }
+        };
+        var accessOpts  = {};
+        // We set `expiresIn` like this to make it possible to send `null` and `exp` to have
+        // no expiration while still having a default of 1 day.
+        if (req.body.hasOwnProperty('exp')) {
+          accessOpts.expiresIn = timespan(req.body.exp, token_info.exp);
+        } else {
+          accessOpts.expiresIn = timespan('1d', token_info.exp);
+        }
+        var refreshOpts = {};
+        refreshOpts.expiresIn = timespan(req.body.refresh_exp, token_info.exp);
+
+        var jwt = require('jsonwebtoken');
+        var result = {};
+        result.scope = token_info.scope;
+        result.access_token = jwt.sign(payload, pem, Object.assign(accessOpts, opts));
+        if (req.body.refresh_token) {
+          if (token_info.refresh_token) {
+            result.refresh_token = token_info.refresh_token;
+          } else {
+            result.refresh_token = jwt.sign(payload, pem, Object.assign(refreshOpts, opts));
+          }
+        }
+        return result;
+      });
+    });
+
+    app.handlePromise(req, res, promise, '[issuer@oauth3.org] create tokens');
+  };
+  restful.createToken.password = function (req) {
+    var params = req.body;
+    if (!params || !params.username) {
+      return PromiseA.reject(PromiseA.OperationalError("must provide the email address as 'username' in the body"));
+    }
+    if ((params.username_type && 'email' !== params.username_type) || !/@/.test(params.username)) {
+      return PromiseA.reject(PromiseA.OperationalError("only email one-time login codes are supported at this time"));
+    }
+    params.username_type = 'email';
+    if (!params.password) {
+      return PromiseA.reject(new OpErr("request missing 'password'"));
+    }
+
+    var codeId = crypto.createHash('sha256').update(params.username_type+':'+params.username).digest('base64');
+    codeId = makeB64UrlSafe(codeId);
+    return req.getSiteStore().then(function (store) {
+      return validateOtp(store.IssuerOauth3OrgCodes, codeId, params.password)
+      .then(function () {
+        return getOrCreate(store, params.username);
+      }).then(function (account) {
+        return {
+          sub: account.accountId,
+          aud: req.params.aud || req.body.aud || req.experienceId,
+          azp: req.params.azp || req.body.azp || req.experienceId,
+        };
+      });
+    });
+  };
+  restful.createToken.issuerToken = function (req) {
+    return require('./common').checkIsserToken(req, req.params.sub || req.body.sub).then(function (sub) {
+      return {
+        sub: sub,
+        aud: req.params.aud || req.body.aud,
+        azp: req.params.azp || req.body.azp,
+        exp: req.oauth3.token.exp,
+      };
+    });
+  };
+  restful.createToken.refreshToken = function (req) {
+    return PromiseA.resolve().then(function () {
+      if (!req.body.refresh_token) {
+        throw new OpErr("missing refresh token");
+      }
+
+      return req.oauth3.verifyAsync(req.body.refresh_token).then(function (token) {
+        return {
+          sub: token.sub,
+          aud: token.aud,
+          azp: token.azp,
+          exp: token.exp,
+          refresh_token: req.body.refresh_token,
+        };
+      });
+    });
+  };
+}
+
+module.exports.create = create;
diff --git a/common.js b/common.js
new file mode 100644
index 0000000..594b66b
--- /dev/null
+++ b/common.js
@@ -0,0 +1,39 @@
+'use strict';
+
+var PromiseA = require('bluebird');
+var OpErr = PromiseA.OperationalError;
+
+function checkIsserToken(req, expectedSub) {
+  if (!req.oauth3 || !req.oauth3.verifyAsync) {
+    return PromiseA.reject(new OpErr("request requires a token for authorization"));
+  }
+  return req.oauth3.verifyAsync().then(function (token) {
+    // Now that we've confirmed the token is valid we also need to make sure the issuer, audience,
+    // and authorized party are all us, because no other app should be managing user identity.
+    if (token.iss !== req.experienceId || token.aud !== token.iss || token.azp !== token.iss) {
+      throw new OpErr("token does not allow access to requested resource");
+    }
+
+    var sub = token.sub || token.ppid || (token.acx && (token.acx.id || token.acx.appScopedId));
+    if (!sub) {
+      if (!expectedSub || !Array.isArray(token.axs) || !token.axs.length) {
+        throw new OpErr("no account pairwise identifier");
+      }
+
+      var allowed = token.axs.some(function (acc) {
+        return expectedSub === (acc.id || acc.ppid || acc.appScopedId);
+      });
+      if (!allowed) {
+        throw new OpErr("no account pairwise identifier matching '" + expectedSub + "'");
+      }
+      sub = expectedSub;
+    }
+
+    if (expectedSub && expectedSub !== sub) {
+      throw new OpErr("token does not allow access to resources for '"+expectedSub+"'");
+    }
+    return sub;
+  });
+}
+
+module.exports.checkIsserToken = checkIsserToken;
diff --git a/grants.js b/grants.js
new file mode 100644
index 0000000..b83b36e
--- /dev/null
+++ b/grants.js
@@ -0,0 +1,76 @@
+'use strict';
+
+var PromiseA = require('bluebird');
+var OpErr = PromiseA.OperationalError;
+
+
+function trim(grant) {
+  return {
+    sub:   grant.sub,
+    azp:   grant.azp,
+    // azpSub: grant.azpSub,
+    scope: grant.scope,
+    updatedAt: parseInt(grant.updatedAt, 10),
+  };
+}
+
+function create(app) {
+  var restful;
+
+  restful.getOne = function (req, res) {
+    var promise = req.Store.get(req.params.sub+'/'+req.params.azp).then(function (grant) {
+      if (!grant) {
+        throw new OpErr('no grants found');
+      }
+      return trim(grant);
+    });
+
+    app.handlePromise(req, res, promise, "[issuer@oauth3.org] retrieve grants");
+  };
+
+  restful.getAll = function (req, res) {
+    var promise = req.Store.find({ sub: req.params.sub }).then(function (results) {
+      return results.map(trim).sort(function (grantA, grantB) {
+        return (grantA.azp < grantB.azp) ? -1 : 1;
+      });
+    });
+
+    app.handlePromise(req, res, promise, "[issuer@oauth3.org] retrieve grants");
+  };
+
+  restful.saveNew = function (req, res) {
+    var promise = PromiseA.resolve().then(function () {
+      if (typeof req.body.scope !== 'string' || typeof req.body.sub !== 'string') {
+        throw new OpErr("malformed request: 'sub' and 'scope' must be strings");
+      }
+      return req.Store.find({ azpSub: req.body.sub });
+    }).then(function (existing) {
+      if (existing.length) {
+        if (existing.length > 1) {
+          throw new OpErr("pre-existing PPID collision detected");
+        } else if (existing[0].sub !== req.params.sub || existing[0].azp !== req.params.azp) {
+          throw new OpErr("PPID collision detected, cannot save authorized party's sub");
+        }
+      }
+
+      var grant = {
+        sub:    req.params.sub,
+        azp:    req.params.azp,
+        azpSub: req.body.sub,
+        scope:  req.body.scope.split(/[+ ,]+/g).join(','),
+      };
+      return req.Store.upsert(grant.sub+'/'+grant.azp, grant);
+    }).then(function () {
+      return {success: true};
+    });
+
+    app.handlePromise(req, res, promise, '[issuer@oauth3.org] save grants');
+  };
+
+  return {
+    trim:    trim,
+    restful: restful,
+  };
+}
+
+module.exports.create = create;
diff --git a/jwks.js b/jwks.js
new file mode 100644
index 0000000..15cd308
--- /dev/null
+++ b/jwks.js
@@ -0,0 +1,109 @@
+'use strict';
+
+var crypto = require('crypto');
+var PromiseA = require('bluebird');
+var OpErr = PromiseA.OperationalError;
+
+function makeB64UrlSafe(b64) {
+  return b64.replace(/\+/g, '-').replace(/\//g, '_').replace(/=*$/, '');
+}
+
+function thumbprint(jwk) {
+  // To produce a thumbprint we need to create a JSON string with only the required keys for
+  // the key type, with the keys sorted lexicographically and no white space. We then need
+  // run it through a SHA-256 and encode the result in url safe base64.
+  // https://stackoverflow.com/questions/42588786/how-to-fingerprint-a-jwk
+  var keys;
+  if (jwk.kty === 'EC') {
+    keys = ['crv', 'x', 'y'];
+  } else if (jwk.kty === 'RSA') {
+    keys = ['e', 'n'];
+  } else {
+    return PromiseA.reject(new Error('invalid JWK key type ' + jwk.kty));
+  }
+  keys.push('kty');
+  keys.sort();
+
+  var missing = keys.filter(function (name) { return !jwk.hasOwnProperty(name); });
+  if (missing.length > 0) {
+    return PromiseA.reject(new Error('JWK of type '+jwk.kty+' missing fields ' + missing));
+  }
+
+  // I'm not 100% sure this behavior is guaranteed by a real standard, but when we use an array
+  // as the replacer argument the keys are always in the order they appeared in the array.
+  var jwkStr = JSON.stringify(jwk, keys);
+  var hash = crypto.createHash('sha256').update(jwkStr).digest('base64');
+  return PromiseA.resolve(makeB64UrlSafe(hash));
+}
+
+function create(app) {
+  var restful = {};
+  restful.get = function (req, res) {
+    // The sub in params is the 3rd party PPID, but the keys are stored by the issuer PPID, so
+    // we need to look up the issuer PPID using the 3rd party PPID.
+    var promise = req.getSiteStore().then(function (store) {
+      if (req.params.kid === req.experienceId) {
+        return store.IssuerOauth3OrgPrivateKeys.get(req.experienceId);
+      }
+
+      return store.IssuerOauth3OrgGrants.find({ azpSub: req.params.sub }).then(function (results) {
+        if (!results.length) {
+          throw new OpErr("unknown PPID '"+req.params.sub+"'");
+        }
+        if (results.length > 1) {
+          // This should not ever happen since there is a check for PPID collisions when saving
+          // grants, but it's probably better to have this check anyway just incase something
+          // happens that isn't currently accounted for.
+          throw new OpErr('PPID collision - unable to safely retrieve keys');
+        }
+
+        return store.IssuerOauth3OrgJwks.get(results[0].sub+'/'+req.params.kid);
+      });
+    }).then(function (jwk) {
+      if (!jwk) {
+        throw new OpErr("no keys stored with kid '"+req.params.kid+"' for PPID "+req.params.sub);
+      }
+
+      // We need to sanitize the key to make sure we don't deliver any private keys fields if
+      // we were given a key we could use to sign tokens on behalf of the user. We also don't
+      // want to deliver the sub or any other PPIDs.
+      var whitelist = [ 'kty', 'alg', 'kid', 'use' ];
+      if (jwk.kty === 'EC') {
+        whitelist = whitelist.concat([ 'crv', 'x', 'y' ]);
+      } else if (jwk.kty === 'RSA') {
+        whitelist = whitelist.concat([ 'e', 'n' ]);
+      }
+
+      var result = {};
+      whitelist.forEach(function (key) {
+        result[key] = jwk[key];
+      });
+      return result;
+    });
+
+    app.handlePromise(req, res, promise, "[issuer@oauth3.org] retrieve JWK");
+  };
+  restful.saveNew = function (req, res) {
+    var jwk = req.body;
+    var promise = thumbprint(jwk).then(function (kid) {
+      if (jwk.kid && jwk.kid !== kid) {
+        throw new OpErr('provided kid "'+jwk.kid+'" does not match calculated "'+kid+'"');
+      }
+      jwk.kid = kid;
+      jwk.sub = req.params.sub;
+
+      return req.Store.upsert(jwk.sub+'/'+jwk.kid, jwk);
+    }).then(function () {
+      return { success: true };
+    });
+
+    app.handlePromise(req, res, promise, "[issuer@oauth3.org] save JWK");
+  };
+
+  return {
+    thumbprint: thumbprint,
+    restful: restful,
+  };
+}
+
+module.exports.create = create;
diff --git a/rest.js b/rest.js
index 7eabd6d..0bbc207 100644
--- a/rest.js
+++ b/rest.js
@@ -1,44 +1,8 @@
 'use strict';
 
-var PromiseA = require('bluebird');
-var crypto = require('crypto');
-var OpErr = PromiseA.OperationalError;
-
-function makeB64UrlSafe(b64) {
-  return b64.replace(/\+/g, '-').replace(/\//g, '_').replace(/=*$/, '');
-}
-
-function timespan(duration, max) {
-  var timestamp = Math.floor(Date.now() / 1000);
-
-  if (!duration) {
-    return;
-  }
-  if (typeof duration === 'string') {
-    duration = Math.floor(require('ms')(duration) / 1000) || 0;
-  }
-  if (typeof duration !== 'number') {
-    return 0;
-  }
-  // Handle the case where the user gave us a timestamp instead of duration for the expiration.
-  // Also make the maximum explicitly defined expiration as one year.
-  if (duration > 31557600) {
-    if (duration > timestamp) {
-      return duration - timestamp;
-    } else {
-      return 31557600;
-    }
-  }
-
-  if (max && timestamp+duration > max) {
-    return max - timestamp;
-  }
-  return duration;
-}
-
 module.exports.create = function (bigconf, deps, app) {
-  var Jwks = { restful: {} };
-  var Grants = { restful: {} };
+  var Jwks = require('./jwks').create(app);
+  var Grants = require('./grants').create(app);
   var Accounts = { restful: {} };
 
   // This tablename is based on the tablename found in the objects in model.js.
@@ -53,511 +17,14 @@ module.exports.create = function (bigconf, deps, app) {
     delete req.Store;
     next();
   }
-
-  function checkIsserToken(req, expectedSub) {
-    if (!req.oauth3 || !req.oauth3.verifyAsync) {
-      return PromiseA.reject(new OpErr("request requires a token for authorization"));
-    }
-    return req.oauth3.verifyAsync().then(function (token) {
-      // Now that we've confirmed the token is valid we also need to make sure the issuer, audience,
-      // and authorized party are all us, because no other app should be managing user identity.
-      if (token.iss !== req.experienceId || token.aud !== token.iss || token.azp !== token.iss) {
-        throw new OpErr("token does not allow access to requested resource");
-      }
-
-      var sub = token.sub || token.ppid || (token.acx && (token.acx.id || token.acx.appScopedId));
-      if (!sub) {
-        if (!expectedSub || !Array.isArray(token.axs) || !token.axs.length) {
-          throw new OpErr("no account pairwise identifier");
-        }
-
-        var allowed = token.axs.some(function (acc) {
-          return expectedSub === (acc.id || acc.ppid || acc.appScopedId);
-        });
-        if (!allowed) {
-          throw new OpErr("no account pairwise identifier matching '" + expectedSub + "'");
-        }
-        sub = expectedSub;
-      }
-
-      if (expectedSub && expectedSub !== sub) {
-        throw new OpErr("token does not allow access to resources for '"+expectedSub+"'");
-      }
-      return sub;
-    });
-  }
   function authorizeIssuer(req, res, next) {
-    var promise = checkIsserToken(req, req.params.sub).then(function () {
+    var promise = require('./common').checkIsserToken(req, req.params.sub).then(function () {
       next();
     });
 
     app.handleRejection(req, res, promise, '[issuer@oauth3.org] authorize req as issuer');
   }
 
-
-  Jwks.thumbprint = function (jwk) {
-    // To produce a thumbprint we need to create a JSON string with only the required keys for
-    // the key type, with the keys sorted lexicographically and no white space. We then need
-    // run it through a SHA-256 and encode the result in url safe base64.
-    // https://stackoverflow.com/questions/42588786/how-to-fingerprint-a-jwk
-    var keys;
-    if (jwk.kty === 'EC') {
-      keys = ['crv', 'x', 'y'];
-    } else if (jwk.kty === 'RSA') {
-      keys = ['e', 'n'];
-    } else {
-      return PromiseA.reject(new Error('invalid JWK key type ' + jwk.kty));
-    }
-    keys.push('kty');
-    keys.sort();
-
-    var missing = keys.filter(function (name) { return !jwk.hasOwnProperty(name); });
-    if (missing.length > 0) {
-      return PromiseA.reject(new Error('JWK of type '+jwk.kty+' missing fields ' + missing));
-    }
-
-    // I'm not 100% sure this behavior is guaranteed by a real standard, but when we use an array
-    // as the replacer argument the keys are always in the order they appeared in the array.
-    var jwkStr = JSON.stringify(jwk, keys);
-    var hash = crypto.createHash('sha256').update(jwkStr).digest('base64');
-    return PromiseA.resolve(makeB64UrlSafe(hash));
-  };
-
-  Jwks.restful.get = function (req, res) {
-    // The sub in params is the 3rd party PPID, but the keys are stored by the issuer PPID, so
-    // we need to look up the issuer PPID using the 3rd party PPID.
-    var promise = req.getSiteStore().then(function (store) {
-      if (req.params.kid === req.experienceId) {
-        return store.IssuerOauth3OrgPrivateKeys.get(req.experienceId);
-      }
-
-      return store.IssuerOauth3OrgGrants.find({ azpSub: req.params.sub }).then(function (results) {
-        if (!results.length) {
-          throw new OpErr("unknown PPID '"+req.params.sub+"'");
-        }
-        if (results.length > 1) {
-          // This should not ever happen since there is a check for PPID collisions when saving
-          // grants, but it's probably better to have this check anyway just incase something
-          // happens that isn't currently accounted for.
-          throw new OpErr('PPID collision - unable to safely retrieve keys');
-        }
-
-        return store.IssuerOauth3OrgJwks.get(results[0].sub+'/'+req.params.kid);
-      });
-    }).then(function (jwk) {
-      if (!jwk) {
-        throw new OpErr("no keys stored with kid '"+req.params.kid+"' for PPID "+req.params.sub);
-      }
-
-      // We need to sanitize the key to make sure we don't deliver any private keys fields if
-      // we were given a key we could use to sign tokens on behalf of the user. We also don't
-      // want to deliver the sub or any other PPIDs.
-      var whitelist = [ 'kty', 'alg', 'kid', 'use' ];
-      if (jwk.kty === 'EC') {
-        whitelist = whitelist.concat([ 'crv', 'x', 'y' ]);
-      } else if (jwk.kty === 'RSA') {
-        whitelist = whitelist.concat([ 'e', 'n' ]);
-      }
-
-      var result = {};
-      whitelist.forEach(function (key) {
-        result[key] = jwk[key];
-      });
-      return result;
-    });
-
-    app.handlePromise(req, res, promise, "[issuer@oauth3.org] retrieve JWK");
-  };
-  Jwks.restful.saveNew = function (req, res) {
-    var jwk = req.body;
-    var promise = Jwks.thumbprint(jwk).then(function (kid) {
-      if (jwk.kid && jwk.kid !== kid) {
-        throw new OpErr('provided kid "'+jwk.kid+'" does not match calculated "'+kid+'"');
-      }
-      jwk.kid = kid;
-      jwk.sub = req.params.sub;
-
-      return req.Store.upsert(jwk.sub+'/'+jwk.kid, jwk);
-    }).then(function () {
-      return { success: true };
-    });
-
-    app.handlePromise(req, res, promise, "[issuer@oauth3.org] save JWK");
-  };
-
-
-  Grants.trim = function (grant) {
-    return {
-      sub:   grant.sub,
-      azp:   grant.azp,
-      // azpSub: grant.azpSub,
-      scope: grant.scope,
-      updatedAt: parseInt(grant.updatedAt, 10),
-    };
-  };
-
-  Grants.restful.getOne = function (req, res) {
-    var promise = req.Store.get(req.params.sub+'/'+req.params.azp).then(function (grant) {
-      if (!grant) {
-        throw new OpErr('no grants found');
-      }
-      return Grants.trim(grant);
-    });
-
-    app.handlePromise(req, res, promise, "[issuer@oauth3.org] retrieve grants");
-  };
-  Grants.restful.getAll = function (req, res) {
-    var promise = req.Store.find({ sub: req.params.sub }).then(function (results) {
-      return results.map(Grants.trim).sort(function (grantA, grantB) {
-        return (grantA.azp < grantB.azp) ? -1 : 1;
-      });
-    });
-
-    app.handlePromise(req, res, promise, "[issuer@oauth3.org] retrieve grants");
-  };
-  Grants.restful.saveNew = function (req, res) {
-    var promise = PromiseA.resolve().then(function () {
-      if (typeof req.body.scope !== 'string' || typeof req.body.sub !== 'string') {
-        throw new OpErr("malformed request: 'sub' and 'scope' must be strings");
-      }
-      return req.Store.find({ azpSub: req.body.sub });
-    }).then(function (existing) {
-      if (existing.length) {
-        if (existing.length > 1) {
-          throw new OpErr("pre-existing PPID collision detected");
-        } else if (existing[0].sub !== req.params.sub || existing[0].azp !== req.params.azp) {
-          throw new OpErr("PPID collision detected, cannot save authorized party's sub");
-        }
-      }
-
-      var grant = {
-        sub:    req.params.sub,
-        azp:    req.params.azp,
-        azpSub: req.body.sub,
-        scope:  req.body.scope.split(/[+ ,]+/g).join(','),
-      };
-      return req.Store.upsert(grant.sub+'/'+grant.azp, grant);
-    }).then(function () {
-      return {success: true};
-    });
-
-    app.handlePromise(req, res, promise, '[issuer@oauth3.org] save grants');
-  };
-
-
-  Accounts.retrieveOtp = function (codeStore, codeId) {
-    return codeStore.get(codeId).then(function (code) {
-      if (!code) {
-        return null;
-      }
-
-      var expires = (new Date(code.expires)).valueOf();
-      if (!expires || Date.now() > expires) {
-        return codeStore.destroy(codeId).then(function () {
-          return null;
-        });
-      }
-
-      return code;
-    });
-  };
-  Accounts.validateOtp = function (codeStore, codeId, token) {
-    if (!codeId) {
-      return PromiseA.reject(new Error("Must provide authcode ID"));
-    }
-    if (!token) {
-      return PromiseA.reject(new Error("Must provide authcode code"));
-    }
-    return codeStore.get(codeId).then(function (code) {
-      if (!code) {
-        throw new OpErr('authcode specified does not exist or has expired');
-      }
-
-      return PromiseA.resolve().then(function () {
-        var attemptsLeft = 3 - (code.attempts && code.attempts.length || 0);
-        if (attemptsLeft <= 0) {
-          throw new OpErr('you have tried to authorize this code too many times');
-        }
-        if (code.code !== token) {
-          throw new OpErr('you have entered the code incorrectly. '+attemptsLeft+' attempts remaining');
-        }
-        // TODO: maybe impose a rate limit, although going fast doesn't help you break the
-        // system when you can only try 3 times total.
-      }).then(function () {
-        return codeStore.destroy(codeId).then(function () {
-          return code;
-        });
-      }, function (err) {
-        code.attempts = code.attempts || [];
-        code.attempts.unshift(new Date());
-
-        return codeStore.upsert(codeId, code).then(function () {
-          return PromiseA.reject(err);
-        }, function () {
-          return PromiseA.reject(err);
-        });
-      });
-    });
-  };
-
-  Accounts.getOrCreate = function (store, username) {
-    return store.IssuerOauth3OrgAccounts.get(username).then(function (account) {
-      if (account) {
-        return account;
-      }
-
-      account = {
-        username:  username,
-        accountId: makeB64UrlSafe(crypto.randomBytes(32).toString('base64')),
-      };
-      return store.IssuerOauth3OrgAccounts.create(username, account).then(function () {
-        // TODO: put sort sort of email notification to the server managers?
-        return account;
-      });
-    });
-  };
-  Accounts.getPrivKey = function (store, experienceId) {
-    return store.IssuerOauth3OrgPrivateKeys.get(experienceId).then(function (jwk) {
-      if (jwk) {
-        return jwk;
-      }
-
-      var keyPair = require('elliptic').ec('p256').genKeyPair();
-      jwk = {
-        kty: 'EC',
-        crv: 'P-256',
-        alg: 'ES256',
-        kid: experienceId,
-        x: makeB64UrlSafe(keyPair.getPublic().getX().toArrayLike(Buffer).toString('base64')),
-        y: makeB64UrlSafe(keyPair.getPublic().getY().toArrayLike(Buffer).toString('base64')),
-        d: makeB64UrlSafe(keyPair.getPrivate().toArrayLike(Buffer).toString('base64')),
-      };
-
-      return store.IssuerOauth3OrgPrivateKeys.upsert(experienceId, jwk).then(function () {
-        return jwk;
-      });
-    });
-  };
-
-  Accounts.restful.sendOtp = function (req, res) {
-    var params = req.body;
-    var promise = PromiseA.resolve().then(function () {
-      if (!params || !params.username) {
-        throw new OpErr("must provide the email address as 'username' in the body");
-      }
-      if ((params.username_type && 'email' !== params.username_type) || !/@/.test(params.username)) {
-        throw new OpErr("only email one-time login codes are supported at this time");
-      }
-      params.username_type = 'email';
-
-      return req.getSiteStore();
-    }).then(function (store) {
-      var codeStore = store.IssuerOauth3OrgCodes;
-      var codeId = crypto.createHash('sha256').update(params.username_type+':'+params.username).digest('base64');
-      codeId = makeB64UrlSafe(codeId);
-
-      return Accounts.retrieveOtp(codeStore, codeId).then(function (code) {
-        if (code) {
-          return code;
-        }
-
-        var token = '';
-        while (!/^\d{4}-\d{4}-\d{4}$/.test(token)) {
-          // Most of the number we can generate this was start with 1 (and no matter what can't
-          // start with 0), so we don't use the very first digit. Also basically all of the
-          // numbers are too big to accurately store in JS floats, so we limit the trailing 0's.
-          token = (parseInt(crypto.randomBytes(8).toString('hex'), 16)).toString()
-            .replace(/0+$/, '0').replace(/\d(\d{4})(\d{4})(\d{4}).*/, '$1-$2-$3');
-        }
-        code = {
-          id: codeId,
-          code: token,
-          expires: new Date(Date.now() + 20*60*1000),
-        };
-        return codeStore.upsert(codeId, code).then(function (){
-          return code;
-        });
-      });
-    }).then(function (code) {
-      var emailParams = {
-        to:      params.username,
-        from:    'login@daplie.com',   // opts.mailer.defaults.system
-        replyTo: 'hello@daplie.com',
-        subject: "Use " + code.code + " as your Login Code",  // message.Subject
-        text:    code.code + " is your Login Code."        // message['stripped-html']
-      };
-      emailParams['h:Reply-To'] = emailParams.replyTo;
-
-      return req.getSiteMailer().sendMailAsync(emailParams).then(function () {
-        return {
-          code_id: code.id,
-          expires: code.expires,
-          created: new Date(parseInt(code.createdAt, 10) || code.createdAt),
-        };
-      });
-    });
-
-    app.handlePromise(req, res, promise, '[issuer@oauth3.org] send one-time-password');
-  };
-
-  Accounts.restful.createToken = function (req, res) {
-    var store;
-    var promise = req.getSiteStore().then(function (_store) {
-      store = _store;
-      if (!req.body || !req.body.grant_type) {
-        throw new OpErr("missing 'grant_type' from the body");
-      }
-
-      if (req.body.grant_type === 'password') {
-        return Accounts.restful.createToken.password(req);
-      }
-      if (req.body.grant_type === 'issuer_token') {
-        return Accounts.restful.createToken.issuerToken(req);
-      }
-      if (req.body.grant_type === 'refresh_token') {
-        return Accounts.restful.createToken.refreshToken(req);
-      }
-
-      throw new OpErr("unknown or un-implemented grant_type '"+req.body.grant_type+"'");
-    }).then(function (token_info) {
-      token_info.iss = req.experienceId;
-      if (!token_info.aud) {
-        throw new OpErr("missing required token field 'aud'");
-      }
-      if (!token_info.azp) {
-        throw new OpErr("missing required token field 'azp'");
-      }
-
-      if (token_info.iss === token_info.azp) {
-        // We don't have normal grants for the issuer, so we don't need to look the
-        // azpSub or the grants up in the database.
-        token_info.azpSub = token_info.sub;
-        token_info.scope = '';
-        return token_info;
-      }
-
-      var search = {};
-      ['sub', 'azp', 'azpSub'].forEach(function (key) {
-        if (token_info[key]) {
-          search[key] = token_info[key];
-        }
-      });
-      return store.IssuerOauth3OrgGrants.find(search).then(function (grants) {
-        if (!grants.length) {
-          throw new OpErr("'"+token_info.azp+"' not given any grants from '"+(token_info.sub || token_info.azpSub)+"'");
-        }
-        if (grants.length > 1) {
-          throw new Error("unexpected resource collision: too many relevant grants");
-        }
-        var grant = grants[0];
-        Object.keys(grant).forEach(function (key) {
-          token_info[key] = grant[key];
-        });
-        return token_info;
-      });
-    }).then(function (token_info) {
-      return Accounts.getPrivKey(store, req.experienceId).then(function (jwk) {
-        var pem = require('jwk-to-pem')(jwk, { private: true });
-        var payload =  {
-          // standard
-          iss: token_info.iss,    // https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32#section-4.1.1
-          aud: token_info.aud,    // https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32#section-4.1.3
-          azp: token_info.azp,
-          sub: token_info.azpSub, // https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-32#section-4.1.2
-          // extended
-          scp: token_info.scope,
-        };
-        var opts = {
-          algorithm: jwk.alg,
-          header: {
-            kid: jwk.kid
-          }
-        };
-        var accessOpts  = {};
-        // We set `expiresIn` like this to make it possible to send `null` and `exp` to have
-        // no expiration while still having a default of 1 day.
-        if (req.body.hasOwnProperty('exp')) {
-          accessOpts.expiresIn = timespan(req.body.exp, token_info.exp);
-        } else {
-          accessOpts.expiresIn = timespan('1d', token_info.exp);
-        }
-        var refreshOpts = {};
-        refreshOpts.expiresIn = timespan(req.body.refresh_exp, token_info.exp);
-
-        var jwt = require('jsonwebtoken');
-        var result = {};
-        result.scope = token_info.scope;
-        result.access_token = jwt.sign(payload, pem, Object.assign(accessOpts, opts));
-        if (req.body.refresh_token) {
-          if (token_info.refresh_token) {
-            result.refresh_token = token_info.refresh_token;
-          } else {
-            result.refresh_token = jwt.sign(payload, pem, Object.assign(refreshOpts, opts));
-          }
-        }
-        return result;
-      });
-    });
-
-    app.handlePromise(req, res, promise, '[issuer@oauth3.org] create tokens');
-  };
-  Accounts.restful.createToken.password = function (req) {
-    var params = req.body;
-    if (!params || !params.username) {
-      return PromiseA.reject(PromiseA.OperationalError("must provide the email address as 'username' in the body"));
-    }
-    if ((params.username_type && 'email' !== params.username_type) || !/@/.test(params.username)) {
-      return PromiseA.reject(PromiseA.OperationalError("only email one-time login codes are supported at this time"));
-    }
-    params.username_type = 'email';
-    if (!params.password) {
-      return PromiseA.reject(new OpErr("request missing 'password'"));
-    }
-
-    var codeId = crypto.createHash('sha256').update(params.username_type+':'+params.username).digest('base64');
-    codeId = makeB64UrlSafe(codeId);
-    return req.getSiteStore().then(function (store) {
-      return Accounts.validateOtp(store.IssuerOauth3OrgCodes, codeId, params.password)
-      .then(function () {
-        return Accounts.getOrCreate(store, params.username);
-      }).then(function (account) {
-        return {
-          sub: account.accountId,
-          aud: req.params.aud || req.body.aud || req.experienceId,
-          azp: req.params.azp || req.body.azp || req.experienceId,
-        };
-      });
-    });
-  };
-  Accounts.restful.createToken.issuerToken = function (req) {
-    return checkIsserToken(req, req.params.sub || req.body.sub).then(function (sub) {
-      return {
-        sub: sub,
-        aud: req.params.aud || req.body.aud,
-        azp: req.params.azp || req.body.azp,
-        exp: req.oauth3.token.exp,
-      };
-    });
-  };
-  Accounts.restful.createToken.refreshToken = function (req) {
-    return PromiseA.resolve().then(function () {
-      if (!req.body.refresh_token) {
-        throw new OpErr("missing refresh token");
-      }
-
-      return req.oauth3.verifyAsync(req.body.refresh_token).then(function (token) {
-        return {
-          sub: token.sub,
-          aud: token.aud,
-          azp: token.azp,
-          exp: token.exp,
-          refresh_token: req.body.refresh_token,
-        };
-      });
-    });
-  };
-
-
   app.get(   '/jwks/:sub/:kid.json', Jwks.restful.get);
   app.get(   '/jwks/:sub/:kid',      Jwks.restful.get);
   // Everything but getting keys is only for the issuer