From 21a6660103d4385fb19488dff4ebb312e0b0a75e Mon Sep 17 00:00:00 2001
From: Chris Cowan <chris@chriscowan.us>
Date: Fri, 25 Sep 2015 11:27:58 -0700
Subject: [PATCH 1/6] Adding filtering to the logger

- Closes #5036
- Add `applyFilterToKey()`
- Add test for `applyFilterToKey()`
- Add `filter` attribute to config for reporters
- Add `this.filter` method to `LogFormat` class
---
 src/server/logging/LogFormat.js               | 16 +++++-
 src/server/logging/LogReporter.js             |  2 +-
 .../logging/__tests__/applyFilterToKey.js     | 49 +++++++++++++++++++
 src/server/logging/applyFilterToKey.js        | 23 +++++++++
 src/server/logging/index.js                   |  5 +-
 5 files changed, 91 insertions(+), 4 deletions(-)
 create mode 100644 src/server/logging/__tests__/applyFilterToKey.js
 create mode 100644 src/server/logging/applyFilterToKey.js

diff --git a/src/server/logging/LogFormat.js b/src/server/logging/LogFormat.js
index db901d2ecc907..eb34d4fa40499 100644
--- a/src/server/logging/LogFormat.js
+++ b/src/server/logging/LogFormat.js
@@ -6,6 +6,7 @@ let ansicolors = require('ansicolors');
 let stringify = require('json-stringify-safe');
 let querystring = require('querystring');
 let inspect = require('util').inspect;
+let applyFilterToKey = require('./applyFilterToKey');
 
 function serializeError(err) {
   return {
@@ -24,16 +25,27 @@ let levelColor = function (code) {
   return ansicolors.red(code);
 };
 
+
 module.exports = class TransformObjStream extends Stream.Transform {
-  constructor() {
+  constructor(config) {
     super({
       readableObjectMode: false,
       writableObjectMode: true
     });
+    this.config = config;
+  }
+
+  filter(data) {
+    if (this.config.filter) {
+      _.each(this.config.filter, (action, key) => {
+        applyFilterToKey(data, key, action);
+      });
+    }
+    return data;
   }
 
   _transform(event, enc, next) {
-    var data = this.readEvent(event);
+    var data = this.filter(this.readEvent(event));
     this.push(this.format(data) + '\n');
     next();
   }
diff --git a/src/server/logging/LogReporter.js b/src/server/logging/LogReporter.js
index 246e8164db60e..ac098732a711a 100644
--- a/src/server/logging/LogReporter.js
+++ b/src/server/logging/LogReporter.js
@@ -8,7 +8,7 @@ let LogFormatString = require('./LogFormatString');
 module.exports = class KbnLogger {
   constructor(events, config) {
     this.squeeze = new Squeeze(events);
-    this.format = config.json ? new LogFormatJson() : new LogFormatString();
+    this.format = config.json ? new LogFormatJson(config) : new LogFormatString(config);
 
     if (config.dest === 'stdout') {
       this.dest = process.stdout;
diff --git a/src/server/logging/__tests__/applyFilterToKey.js b/src/server/logging/__tests__/applyFilterToKey.js
new file mode 100644
index 0000000000000..ef319a216297b
--- /dev/null
+++ b/src/server/logging/__tests__/applyFilterToKey.js
@@ -0,0 +1,49 @@
+var applyFilterToKey = require('../applyFilterToKey');
+var expect = require('expect.js');
+
+function fixture() {
+  return {
+    req: {
+      headers: {
+        authorization: 'Basic dskd939k2i'
+      }
+    }
+  };
+}
+
+describe('applyFilterToKey(obj, key, action)', function () {
+
+  it('should remove a key from an object recursivly', function () {
+    var data = fixture();
+    applyFilterToKey(data, 'authorization', 'remove');
+    expect(data).to.eql({
+      req: { headers: {} }
+    });
+  });
+
+  it('should censor a key in an object recursivly', function () {
+    var data = fixture();
+    applyFilterToKey(data, 'authorization', 'censor');
+    expect(data).to.eql({
+      req: {
+        headers: {
+          authorization: 'XXXXXXXXXXXXXXXX'
+        }
+      }
+    });
+  });
+
+  it('should censor key with a RegEx in an object recursivly', function () {
+    var data = fixture();
+    var regex = /([^\s]+)$/;
+    applyFilterToKey(data, 'authorization', regex);
+    expect(data).to.eql({
+      req: {
+        headers: {
+          authorization: 'Basic XXXXXXXXXX'
+        }
+      }
+    });
+  });
+
+});
diff --git a/src/server/logging/applyFilterToKey.js b/src/server/logging/applyFilterToKey.js
new file mode 100644
index 0000000000000..6046ee867c684
--- /dev/null
+++ b/src/server/logging/applyFilterToKey.js
@@ -0,0 +1,23 @@
+function replacer(match, group) {
+  return (new Array(group.length + 1).join('X'));
+}
+
+module.exports = function applyFilterToKey(obj, key, action) {
+  for (let k in obj)  {
+    if (obj.hasOwnProperty(k)) {
+      let val = obj[k];
+      if (typeof val === 'object') {
+        applyFilterToKey(val, key, action);
+      } else if (k === key) {
+        val = ''  + val;
+        if (action === 'remove') delete obj[k];
+        if (action === 'censor') {
+          obj[k] = val.replace(/./g, 'X');
+        };
+        if (action instanceof RegExp) {
+          obj[k] = val.replace(action, replacer);
+        }
+      }
+    }
+  }
+};
diff --git a/src/server/logging/index.js b/src/server/logging/index.js
index 8ac4bb4d7ef85..ee8c169565339 100644
--- a/src/server/logging/index.js
+++ b/src/server/logging/index.js
@@ -42,7 +42,10 @@ module.exports = function (kbnServer, server, config) {
             reporter: require('./LogReporter'),
             config: {
               json: config.get('logging.json'),
-              dest: config.get('logging.dest')
+              dest: config.get('logging.dest'),
+              filter: {
+                authorization: 'remove'
+              }
             },
             events: _.transform(events, function (filtered, val, key) {
               // provide a string compatible way to remove events

From 71d65e4adb5a2ce496679c4a28733b14388f9996 Mon Sep 17 00:00:00 2001
From: Chris Cowan <chris@chriscowan.us>
Date: Fri, 25 Sep 2015 11:44:48 -0700
Subject: [PATCH 2/6] Moving key match above recursion for removing branches

---
 src/server/logging/__tests__/applyFilterToKey.js | 8 ++++++++
 src/server/logging/applyFilterToKey.js           | 6 +++---
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/server/logging/__tests__/applyFilterToKey.js b/src/server/logging/__tests__/applyFilterToKey.js
index ef319a216297b..53a932f716e2c 100644
--- a/src/server/logging/__tests__/applyFilterToKey.js
+++ b/src/server/logging/__tests__/applyFilterToKey.js
@@ -21,6 +21,14 @@ describe('applyFilterToKey(obj, key, action)', function () {
     });
   });
 
+  it('should remove an entire branch', function () {
+    var data = fixture();
+    applyFilterToKey(data, 'headers', 'remove');
+    expect(data).to.eql({
+      req: { }
+    });
+  });
+
   it('should censor a key in an object recursivly', function () {
     var data = fixture();
     applyFilterToKey(data, 'authorization', 'censor');
diff --git a/src/server/logging/applyFilterToKey.js b/src/server/logging/applyFilterToKey.js
index 6046ee867c684..06f7bae0e9923 100644
--- a/src/server/logging/applyFilterToKey.js
+++ b/src/server/logging/applyFilterToKey.js
@@ -6,9 +6,7 @@ module.exports = function applyFilterToKey(obj, key, action) {
   for (let k in obj)  {
     if (obj.hasOwnProperty(k)) {
       let val = obj[k];
-      if (typeof val === 'object') {
-        applyFilterToKey(val, key, action);
-      } else if (k === key) {
+      if (k === key) {
         val = ''  + val;
         if (action === 'remove') delete obj[k];
         if (action === 'censor') {
@@ -17,6 +15,8 @@ module.exports = function applyFilterToKey(obj, key, action) {
         if (action instanceof RegExp) {
           obj[k] = val.replace(action, replacer);
         }
+      } else if (typeof val === 'object') {
+        applyFilterToKey(val, key, action);
       }
     }
   }

From 6b1e0899376655775eaf2989c729026fc9ce7a76 Mon Sep 17 00:00:00 2001
From: Chris Cowan <chris@chriscowan.us>
Date: Sat, 26 Sep 2015 10:09:56 -0700
Subject: [PATCH 3/6] Fixing Edge Cases

- Add ability to specify filters from CLI options
- Add test and fix for removing branch with censor
- Add change regex to use strings
---
 src/server/config/schema.js                   |  2 +-
 .../logging/__tests__/applyFilterToKey.js     | 10 +++++++-
 src/server/logging/applyFilterToKey.js        | 24 +++++++++++++------
 src/server/logging/index.js                   |  8 +++++--
 4 files changed, 33 insertions(+), 11 deletions(-)

diff --git a/src/server/config/schema.js b/src/server/config/schema.js
index dc960c6841893..69b50dc7aaf8b 100644
--- a/src/server/config/schema.js
+++ b/src/server/config/schema.js
@@ -61,7 +61,7 @@ module.exports = Joi.object({
 
     events: Joi.any().default({}),
     dest: Joi.string().default('stdout'),
-
+    filter: Joi.any().default({}),
     json: Joi.boolean()
     .when('dest', {
       is: 'stdout',
diff --git a/src/server/logging/__tests__/applyFilterToKey.js b/src/server/logging/__tests__/applyFilterToKey.js
index 53a932f716e2c..1d91b2b4d9611 100644
--- a/src/server/logging/__tests__/applyFilterToKey.js
+++ b/src/server/logging/__tests__/applyFilterToKey.js
@@ -29,6 +29,14 @@ describe('applyFilterToKey(obj, key, action)', function () {
     });
   });
 
+  it('should remove an entire branch with censor', function () {
+    var data = fixture();
+    applyFilterToKey(data, 'headers', 'censor');
+    expect(data).to.eql({
+      req: { }
+    });
+  });
+
   it('should censor a key in an object recursivly', function () {
     var data = fixture();
     applyFilterToKey(data, 'authorization', 'censor');
@@ -43,7 +51,7 @@ describe('applyFilterToKey(obj, key, action)', function () {
 
   it('should censor key with a RegEx in an object recursivly', function () {
     var data = fixture();
-    var regex = /([^\s]+)$/;
+    var regex = '/([^\\s]+)$/';
     applyFilterToKey(data, 'authorization', regex);
     expect(data).to.eql({
       req: {
diff --git a/src/server/logging/applyFilterToKey.js b/src/server/logging/applyFilterToKey.js
index 06f7bae0e9923..8a3ab9e5399d9 100644
--- a/src/server/logging/applyFilterToKey.js
+++ b/src/server/logging/applyFilterToKey.js
@@ -7,13 +7,23 @@ module.exports = function applyFilterToKey(obj, key, action) {
     if (obj.hasOwnProperty(k)) {
       let val = obj[k];
       if (k === key) {
-        val = ''  + val;
-        if (action === 'remove') delete obj[k];
-        if (action === 'censor') {
-          obj[k] = val.replace(/./g, 'X');
-        };
-        if (action instanceof RegExp) {
-          obj[k] = val.replace(action, replacer);
+        if (action === 'remove') {
+          delete obj[k];
+        }
+        else if (action === 'censor' && typeof val === 'object') {
+          delete obj[key];
+        }
+        else if (action === 'censor') {
+          obj[k] = ('' + val).replace(/./g, 'X');
+        }
+        else if (/\/.+\//.test(action)) {
+          var matches = action.match(/\/(.+)\//);
+          try {
+            let regex = new RegExp(matches[1]);
+            obj[k] = ('' + val).replace(regex, replacer);
+          } catch (e) {
+            //meh
+          }
         }
       } else if (typeof val === 'object') {
         applyFilterToKey(val, key, action);
diff --git a/src/server/logging/index.js b/src/server/logging/index.js
index ee8c169565339..2763baa462081 100644
--- a/src/server/logging/index.js
+++ b/src/server/logging/index.js
@@ -43,9 +43,13 @@ module.exports = function (kbnServer, server, config) {
             config: {
               json: config.get('logging.json'),
               dest: config.get('logging.dest'),
-              filter: {
+              // I'm adding the default here because if you add another filter
+              // using the commandline it will remove authorization. I want users
+              // to have to explicitly set --logging.filter.authorization=none to
+              // have it show up int he logs.
+              filter: _.defaults(config.get('logging.filter'), {
                 authorization: 'remove'
-              }
+              })
             },
             events: _.transform(events, function (filtered, val, key) {
               // provide a string compatible way to remove events

From 786e87bde5bd7caddb54d3741c53dd67751b22da Mon Sep 17 00:00:00 2001
From: Chris Cowan <chris@chriscowan.us>
Date: Sat, 26 Sep 2015 10:34:51 -0700
Subject: [PATCH 4/6] Refactoring the regex codes

---
 src/server/logging/applyFilterToKey.js | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/server/logging/applyFilterToKey.js b/src/server/logging/applyFilterToKey.js
index 8a3ab9e5399d9..c3486e34b6f88 100644
--- a/src/server/logging/applyFilterToKey.js
+++ b/src/server/logging/applyFilterToKey.js
@@ -18,11 +18,9 @@ module.exports = function applyFilterToKey(obj, key, action) {
         }
         else if (/\/.+\//.test(action)) {
           var matches = action.match(/\/(.+)\//);
-          try {
+          if (matches) {
             let regex = new RegExp(matches[1]);
             obj[k] = ('' + val).replace(regex, replacer);
-          } catch (e) {
-            //meh
           }
         }
       } else if (typeof val === 'object') {

From dfcf6e310bc30c7c332cad05ee916be6a933e998 Mon Sep 17 00:00:00 2001
From: spalger <email@spalger.com>
Date: Wed, 30 Sep 2015 03:53:04 +0200
Subject: [PATCH 5/6] [server/log] simplify the log messages before filtering

`applyFilterToKey()` used to choke on circular structures by simply recursing through the object passed in. When we create a circular structure though, we generally provide a simplified version of the object via `obj#toJSON()`. This makes logging those objects simple, and now the filter will use the same mechanism before attempting to itterate the object.
---
 src/server/logging/LogFormat.js               | 10 ++--
 .../logging/__tests__/applyFilterToKey.js     | 51 +++++++++++++++++--
 src/server/logging/applyFilterToKey.js        | 19 ++++++-
 3 files changed, 66 insertions(+), 14 deletions(-)

diff --git a/src/server/logging/LogFormat.js b/src/server/logging/LogFormat.js
index eb34d4fa40499..9bc7be017176c 100644
--- a/src/server/logging/LogFormat.js
+++ b/src/server/logging/LogFormat.js
@@ -6,7 +6,7 @@ let ansicolors = require('ansicolors');
 let stringify = require('json-stringify-safe');
 let querystring = require('querystring');
 let inspect = require('util').inspect;
-let applyFilterToKey = require('./applyFilterToKey');
+let applyFiltersToKeys = require('./applyFilterToKey').applyFiltersToKeys;
 
 function serializeError(err) {
   return {
@@ -36,12 +36,8 @@ module.exports = class TransformObjStream extends Stream.Transform {
   }
 
   filter(data) {
-    if (this.config.filter) {
-      _.each(this.config.filter, (action, key) => {
-        applyFilterToKey(data, key, action);
-      });
-    }
-    return data;
+    if (!this.config.filter) return data;
+    return applyFiltersToKeys(data, this.config.filter);
   }
 
   _transform(event, enc, next) {
diff --git a/src/server/logging/__tests__/applyFilterToKey.js b/src/server/logging/__tests__/applyFilterToKey.js
index 1d91b2b4d9611..776a12138ff8d 100644
--- a/src/server/logging/__tests__/applyFilterToKey.js
+++ b/src/server/logging/__tests__/applyFilterToKey.js
@@ -1,4 +1,5 @@
 var applyFilterToKey = require('../applyFilterToKey');
+var applyFiltersToKeys = applyFilterToKey.applyFiltersToKeys;
 var expect = require('expect.js');
 
 function fixture() {
@@ -15,7 +16,7 @@ describe('applyFilterToKey(obj, key, action)', function () {
 
   it('should remove a key from an object recursivly', function () {
     var data = fixture();
-    applyFilterToKey(data, 'authorization', 'remove');
+    data = applyFilterToKey(data, 'authorization', 'remove');
     expect(data).to.eql({
       req: { headers: {} }
     });
@@ -23,7 +24,7 @@ describe('applyFilterToKey(obj, key, action)', function () {
 
   it('should remove an entire branch', function () {
     var data = fixture();
-    applyFilterToKey(data, 'headers', 'remove');
+    data = applyFilterToKey(data, 'headers', 'remove');
     expect(data).to.eql({
       req: { }
     });
@@ -31,7 +32,7 @@ describe('applyFilterToKey(obj, key, action)', function () {
 
   it('should remove an entire branch with censor', function () {
     var data = fixture();
-    applyFilterToKey(data, 'headers', 'censor');
+    data = applyFilterToKey(data, 'headers', 'censor');
     expect(data).to.eql({
       req: { }
     });
@@ -39,7 +40,7 @@ describe('applyFilterToKey(obj, key, action)', function () {
 
   it('should censor a key in an object recursivly', function () {
     var data = fixture();
-    applyFilterToKey(data, 'authorization', 'censor');
+    data = applyFilterToKey(data, 'authorization', 'censor');
     expect(data).to.eql({
       req: {
         headers: {
@@ -52,7 +53,7 @@ describe('applyFilterToKey(obj, key, action)', function () {
   it('should censor key with a RegEx in an object recursivly', function () {
     var data = fixture();
     var regex = '/([^\\s]+)$/';
-    applyFilterToKey(data, 'authorization', regex);
+    data = applyFilterToKey(data, 'authorization', regex);
     expect(data).to.eql({
       req: {
         headers: {
@@ -62,4 +63,44 @@ describe('applyFilterToKey(obj, key, action)', function () {
     });
   });
 
+  it('uses the JSON version of objects for serializaion', function () {
+    var data = applyFilterToKey({
+      a: {
+        b: 1,
+        toJSON: () => ({ c: 10 })
+      }
+    }, 'c', 'censor');
+
+    expect(data).to.eql({
+      a: {
+        c: 'XX'
+      }
+    });
+  });
+
+  describe('applyFiltersToKeys(obj, actionsByKey)', function () {
+    it('applies applyFilterToKey() for each key+prop in actionsByKey', function () {
+      var data = applyFiltersToKeys({
+        a: {
+          b: {
+            c: 1
+          },
+          d: {
+            e: 'foobar'
+          }
+        }
+      }, {
+        b: 'remove',
+        e: 'censor',
+      });
+
+      expect(data).to.eql({
+        a: {
+          d: {
+            e: 'XXXXXX',
+          },
+        },
+      });
+    });
+  });
 });
diff --git a/src/server/logging/applyFilterToKey.js b/src/server/logging/applyFilterToKey.js
index c3486e34b6f88..df399eb867326 100644
--- a/src/server/logging/applyFilterToKey.js
+++ b/src/server/logging/applyFilterToKey.js
@@ -1,8 +1,12 @@
+function toPojo(obj) {
+  return JSON.parse(JSON.stringify(obj));
+}
+
 function replacer(match, group) {
   return (new Array(group.length + 1).join('X'));
 }
 
-module.exports = function applyFilterToKey(obj, key, action) {
+function apply(obj, key, action) {
   for (let k in obj)  {
     if (obj.hasOwnProperty(k)) {
       let val = obj[k];
@@ -24,8 +28,19 @@ module.exports = function applyFilterToKey(obj, key, action) {
           }
         }
       } else if (typeof val === 'object') {
-        applyFilterToKey(val, key, action);
+        val = apply(val, key, action);
       }
     }
   }
+  return obj;
+}
+
+module.exports = function applyFilterToKey(obj, key, action) {
+  return apply(toPojo(obj), key, action);
+};
+
+module.exports.applyFiltersToKeys = function (obj, actionsByKey) {
+  return Object.keys(actionsByKey).reduce((output, key) => {
+    return apply(output, key, actionsByKey[key]);
+  }, toPojo(obj));
 };

From 7169d3becc3a8460909c97a16d992bdd7fee4a8a Mon Sep 17 00:00:00 2001
From: Chris Cowan <chris@chriscowan.us>
Date: Wed, 7 Oct 2015 18:29:51 -0700
Subject: [PATCH 6/6] Refactoring to simpliefy things a bit

---
 src/server/logging/LogFormat.js               |   2 +-
 .../logging/__tests__/applyFilterToKey.js     | 106 ------------------
 .../logging/__tests__/applyFiltersToKeys.js   |  39 +++++++
 ...lyFilterToKey.js => applyFiltersToKeys.js} |   6 +-
 4 files changed, 41 insertions(+), 112 deletions(-)
 delete mode 100644 src/server/logging/__tests__/applyFilterToKey.js
 create mode 100644 src/server/logging/__tests__/applyFiltersToKeys.js
 rename src/server/logging/{applyFilterToKey.js => applyFiltersToKeys.js} (85%)

diff --git a/src/server/logging/LogFormat.js b/src/server/logging/LogFormat.js
index 9bc7be017176c..18832199fa91a 100644
--- a/src/server/logging/LogFormat.js
+++ b/src/server/logging/LogFormat.js
@@ -6,7 +6,7 @@ let ansicolors = require('ansicolors');
 let stringify = require('json-stringify-safe');
 let querystring = require('querystring');
 let inspect = require('util').inspect;
-let applyFiltersToKeys = require('./applyFilterToKey').applyFiltersToKeys;
+let applyFiltersToKeys = require('./applyFiltersToKeys');
 
 function serializeError(err) {
   return {
diff --git a/src/server/logging/__tests__/applyFilterToKey.js b/src/server/logging/__tests__/applyFilterToKey.js
deleted file mode 100644
index 776a12138ff8d..0000000000000
--- a/src/server/logging/__tests__/applyFilterToKey.js
+++ /dev/null
@@ -1,106 +0,0 @@
-var applyFilterToKey = require('../applyFilterToKey');
-var applyFiltersToKeys = applyFilterToKey.applyFiltersToKeys;
-var expect = require('expect.js');
-
-function fixture() {
-  return {
-    req: {
-      headers: {
-        authorization: 'Basic dskd939k2i'
-      }
-    }
-  };
-}
-
-describe('applyFilterToKey(obj, key, action)', function () {
-
-  it('should remove a key from an object recursivly', function () {
-    var data = fixture();
-    data = applyFilterToKey(data, 'authorization', 'remove');
-    expect(data).to.eql({
-      req: { headers: {} }
-    });
-  });
-
-  it('should remove an entire branch', function () {
-    var data = fixture();
-    data = applyFilterToKey(data, 'headers', 'remove');
-    expect(data).to.eql({
-      req: { }
-    });
-  });
-
-  it('should remove an entire branch with censor', function () {
-    var data = fixture();
-    data = applyFilterToKey(data, 'headers', 'censor');
-    expect(data).to.eql({
-      req: { }
-    });
-  });
-
-  it('should censor a key in an object recursivly', function () {
-    var data = fixture();
-    data = applyFilterToKey(data, 'authorization', 'censor');
-    expect(data).to.eql({
-      req: {
-        headers: {
-          authorization: 'XXXXXXXXXXXXXXXX'
-        }
-      }
-    });
-  });
-
-  it('should censor key with a RegEx in an object recursivly', function () {
-    var data = fixture();
-    var regex = '/([^\\s]+)$/';
-    data = applyFilterToKey(data, 'authorization', regex);
-    expect(data).to.eql({
-      req: {
-        headers: {
-          authorization: 'Basic XXXXXXXXXX'
-        }
-      }
-    });
-  });
-
-  it('uses the JSON version of objects for serializaion', function () {
-    var data = applyFilterToKey({
-      a: {
-        b: 1,
-        toJSON: () => ({ c: 10 })
-      }
-    }, 'c', 'censor');
-
-    expect(data).to.eql({
-      a: {
-        c: 'XX'
-      }
-    });
-  });
-
-  describe('applyFiltersToKeys(obj, actionsByKey)', function () {
-    it('applies applyFilterToKey() for each key+prop in actionsByKey', function () {
-      var data = applyFiltersToKeys({
-        a: {
-          b: {
-            c: 1
-          },
-          d: {
-            e: 'foobar'
-          }
-        }
-      }, {
-        b: 'remove',
-        e: 'censor',
-      });
-
-      expect(data).to.eql({
-        a: {
-          d: {
-            e: 'XXXXXX',
-          },
-        },
-      });
-    });
-  });
-});
diff --git a/src/server/logging/__tests__/applyFiltersToKeys.js b/src/server/logging/__tests__/applyFiltersToKeys.js
new file mode 100644
index 0000000000000..bb900f3fa2fbc
--- /dev/null
+++ b/src/server/logging/__tests__/applyFiltersToKeys.js
@@ -0,0 +1,39 @@
+var applyFiltersToKeys = require('../applyFiltersToKeys');
+var expect = require('expect.js');
+
+describe('applyFiltersToKeys(obj, actionsByKey)', function () {
+  it('applies for each key+prop in actionsByKey', function () {
+    var data = applyFiltersToKeys({
+      a: {
+        b: {
+          c: 1
+        },
+        d: {
+          e: 'foobar'
+        }
+      },
+      req: {
+        headers: {
+          authorization: 'Basic dskd939k2i'
+        }
+      }
+    }, {
+      b: 'remove',
+      e: 'censor',
+      authorization: '/([^\\s]+)$/'
+    });
+
+    expect(data).to.eql({
+      a: {
+        d: {
+          e: 'XXXXXX',
+        },
+      },
+      req: {
+        headers: {
+          authorization: 'Basic XXXXXXXXXX'
+        }
+      }
+    });
+  });
+});
diff --git a/src/server/logging/applyFilterToKey.js b/src/server/logging/applyFiltersToKeys.js
similarity index 85%
rename from src/server/logging/applyFilterToKey.js
rename to src/server/logging/applyFiltersToKeys.js
index df399eb867326..860bdd38b76f0 100644
--- a/src/server/logging/applyFilterToKey.js
+++ b/src/server/logging/applyFiltersToKeys.js
@@ -35,11 +35,7 @@ function apply(obj, key, action) {
   return obj;
 }
 
-module.exports = function applyFilterToKey(obj, key, action) {
-  return apply(toPojo(obj), key, action);
-};
-
-module.exports.applyFiltersToKeys = function (obj, actionsByKey) {
+module.exports = function (obj, actionsByKey) {
   return Object.keys(actionsByKey).reduce((output, key) => {
     return apply(output, key, actionsByKey[key]);
   }, toPojo(obj));