Merge #14618: rpc: Make HTTP RPC debug logging more informative

ab8c6f2 Add SAFE_CHARS[SAFE_CHARS_URI]: Chars allowed in URIs (RFC 3986) (practicalswift)
9912486 rpc: Make HTTP RPC debug logging more informative (practicalswift)

Pull request description:

  * Make HTTP RPC debug logging more informative
  * Avoid excessively large log messages (which could theoretically fill up the disk) when running with debug option `-debug=http`

Tree-SHA512: 9068862fb7d34db1e12e6b9dde78b669b86c65b4fed3ea8c9eb6c35310d77fd12b16644728fd7e9fbf25059d25114bded9e061eb3de649d8847486ec42041ce9

Author: laanwj

src/httpserver.cpp

@@ -224,21 +224,25 @@ static void http_request_cb(struct evhttp_request* req, void* arg)
     }
     std::unique_ptr<HTTPRequest> hreq(new HTTPRequest(req));
 
-    LogPrint(BCLog::HTTP, "Received a %s request for %s from %s\n",
-             RequestMethodString(hreq->GetRequestMethod()), hreq->GetURI(), hreq->GetPeer().ToString());
-
     // Early address-based allow check
     if (!ClientAllowed(hreq->GetPeer())) {
+        LogPrint(BCLog::HTTP, "HTTP request from %s rejected: Client network is not allowed RPC access\n",
+                 hreq->GetPeer().ToString());
         hreq->WriteReply(HTTP_FORBIDDEN);
         return;
     }
 
     // Early reject unknown HTTP methods
     if (hreq->GetRequestMethod() == HTTPRequest::UNKNOWN) {
+        LogPrint(BCLog::HTTP, "HTTP request from %s rejected: Unknown HTTP request method\n",
+                 hreq->GetPeer().ToString());
         hreq->WriteReply(HTTP_BADMETHOD);
         return;
     }
 
+    LogPrint(BCLog::HTTP, "Received a %s request for %s from %s\n",
+             RequestMethodString(hreq->GetRequestMethod()), SanitizeString(hreq->GetURI(), SAFE_CHARS_URI).substr(0, 100), hreq->GetPeer().ToString());
+
     // Find registered handler for prefix
     std::string strURI = hreq->GetURI();
     std::string path;

src/util/strencodings.cpp

@@ -20,6 +20,7 @@ static const std::string SAFE_CHARS[] =
     CHARS_ALPHA_NUM + " .,;-_/:?@()", // SAFE_CHARS_DEFAULT
     CHARS_ALPHA_NUM + " .,;-_?@", // SAFE_CHARS_UA_COMMENT
     CHARS_ALPHA_NUM + ".-_", // SAFE_CHARS_FILENAME
+    CHARS_ALPHA_NUM + "!*'();:@&=+$,/?#[]-_.~%", // SAFE_CHARS_URI
 };
 
 std::string SanitizeString(const std::string& str, int rule)

src/util/strencodings.h

@@ -25,6 +25,7 @@ enum SafeChars
     SAFE_CHARS_DEFAULT, //!< The full set of allowed chars
     SAFE_CHARS_UA_COMMENT, //!< BIP-0014 subset
     SAFE_CHARS_FILENAME, //!< Chars allowed in filenames
+    SAFE_CHARS_URI, //!< Chars allowed in URIs (RFC 3986)
 };
 
 /**