move GH hook verification to github.d

Author: MartinNowak

source/dlangbot/app.d

@@ -87,26 +87,6 @@ void startServer(HTTPServerSettings settings)
 // Github hook
 //==============================================================================
 
-auto getSignature(string data)
-{
-    import std.digest.digest, std.digest.hmac, std.digest.sha;
-    import std.string : representation;
-
-    auto hmac = HMAC!SHA1(hookSecret.representation);
-    hmac.put(data.representation);
-    return hmac.finish.toHexString!(LetterCase.lower);
-}
-
-Json verifyRequest(string signature, string data)
-{
-    import std.exception : enforce;
-    import std.string : chompPrefix;
-
-    enforce(getSignature(data) == signature.chompPrefix("sha1="),
-            "Hook signature mismatch");
-    return parseJsonString(data);
-}
-
 void trelloHook(HTTPServerRequest req, HTTPServerResponse res)
 {
     import std.array : array;
@@ -130,6 +110,7 @@ void trelloHook(HTTPServerRequest req, HTTPServerResponse res)
 void githubHook(HTTPServerRequest req, HTTPServerResponse res)
 {
     import std.functional : toDelegate;
+    import dlangbot.github : verifyRequest;
 
     auto json = verifyRequest(req.headers["X-Hub-Signature"], req.bodyReader.readAllUTF8);
     switch (req.headers["X-GitHub-Event"])

source/dlangbot/github.d

@@ -562,3 +562,27 @@ struct GHMerge
     string sha;
     @name("merge_method") @byName MergeMethod mergeMethod;
 }
+
+//==============================================================================
+// Github hook signature
+//==============================================================================
+
+auto getSignature(string data)
+{
+    import std.digest.digest, std.digest.hmac, std.digest.sha;
+    import std.string : representation;
+
+    auto hmac = HMAC!SHA1(hookSecret.representation);
+    hmac.put(data.representation);
+    return hmac.finish.toHexString!(LetterCase.lower);
+}
+
+Json verifyRequest(string signature, string data)
+{
+    import std.exception : enforce;
+    import std.string : chompPrefix;
+
+    enforce(getSignature(data) == signature.chompPrefix("sha1="),
+            "Hook signature mismatch");
+    return parseJsonString(data);
+}

test/utils.d

@@ -209,6 +209,7 @@ void postGitHubHook(string payload, string eventType = "pull_request",
 {
     import std.file : readText;
     import std.path : buildPath;
+    import dlangbot.github : getSignature;
 
     logInfo("Starting test in %s:%d with payload: %s", file, line, payload);