From 8289aa3db4b9413aba487732877b161b2e79d6d7 Mon Sep 17 00:00:00 2001
From: nekobit <nekobit@noemail.net>
Date: Thu, 29 Sep 2022 03:07:09 +0000
Subject: [PATCH] call_if_match implementation (untested)

FossilOrigin-Name: 1edbe4f7555dce7630f91ba8e8ad23739686550757a9a7707ac1aaab86d8ef40
---
 src/http/request.cpp | 46 ++++++++++++++++++++++++++++++++++++++++++++
 src/http/request.h   |  7 +++++--
 2 files changed, 51 insertions(+), 2 deletions(-)

diff --git a/src/http/request.cpp b/src/http/request.cpp
index 183e5f6..41c6217 100644
--- a/src/http/request.cpp
+++ b/src/http/request.cpp
@@ -16,6 +16,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+#include <algorithm>
 #include "request.h"
 
 using namespace HTTP;
@@ -28,5 +29,50 @@ Request::Request(Type type, const std::string url, RequestCallback_t func)
 
 bool Request::call_if_match(Type type, const std::string& string)
 {
+    // Before doing anything, check if the type (POST, GET...) are the same
+    if (type != this->type) return false;
+    
+    std::vector<std::string> args{};
+    // Current point of `string'
+    size_t curr = std::string::npos;
+    size_t n, n_last = std::string::npos;
+    bool match = true;
 
+    while((n = url.find(':', n)) != std::string::npos)
+    {
+        // Compare range from start to found point
+        if (!std::equal(url.begin() + n_last,
+                        string.begin() + n_last,
+                        string.begin() + (n-1)))
+            return false;
+
+        // Peek next character to know where to stop (often a '/')
+        size_t next_char_dist = url.find(n+1, n);
+        if (next_char_dist != std::string::npos)
+        {
+            // Push string
+            args.push_back(string.substr(n, next_char_dist));
+            // Seek n past next_char
+            n += next_char_dist;
+        }
+        else {
+            // Out of bounds, last argument
+            args.push_back(string.substr(n));
+        }
+        
+        n_last = n;
+    }
+
+    // If previous loop couldn't find anything, check if strings aren't fully equal
+    if (n == std::string::npos &&
+        n_last == std::string::npos &&
+        url != string)
+    {
+        // ... if so, this doesn't match
+        return false;
+    }
+
+    callback(args);
+    
+    return true;
 }
diff --git a/src/http/request.h b/src/http/request.h
index 912ae43..a3d1665 100644
--- a/src/http/request.h
+++ b/src/http/request.h
@@ -29,11 +29,14 @@ namespace HTTP
      * @brief A HTTP Request structure
      *
      * A very simple format is used for the URL to match paremeters.
-     * If a ':' character is in place, then it will read until the next '/' character
+     * If a ':' character is in place, then it will read until the next character (often '/')
      * or until the next end of line.
      *
      * Example: /api/v1/user/:/haters
-     *          /api/v1/user/:/dislike_user/:
+     *
+     * Example 2: /api/v1/user/:/dislike_user/:
+     *
+     * Example 3: /lets/get/:_fails/or/wins_:
      */
     class Request
     {