Added support for mystery person (aka mystery man)

CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required (VERSION 3.2)
 project(libravatarserv
-        VERSION 0.3.2
+        VERSION 0.4.0
         LANGUAGES CXX
 )
 

README.md

@@ -12,7 +12,7 @@ images tied to email or OpenID addresses.
 * MD5 hashes
 * SHA256 hashes
 * Variable image size (`s` or `size`)
-* Default actions (`d` or `default`): 404, URL
+* Default actions (`d` or `default`): 404, URL, mp/mm
 
 The default behaviour for unknown users is to return a 404 error. If a default
 image is put in the avatar directory, that is returned instead. The default
@@ -47,6 +47,10 @@ variable `${LIBRAVATARSERV_DIR}` (until 0.3.0 `${AVATAR_DIR}`).
 The image files are named like your email address, no file extension. If you
 want to deliver a default image for unknown email addresses, name it `default`.
 
+If you want to support "Mystery persons" (mp/mm) as default avatars, place a
+file named `mp` in the avatar dir. You can use the [default libravatar mystery
+person](https://seccdn.libravatar.org/mm/512.png), for example.
+
 Test your setup on https://www.libravatar.org/tools/check/.
 
 ### Example

src/image.cpp

@@ -17,6 +17,7 @@
 #include <iostream>
 #include "libravatarserv.hpp"
 
+using std::cout;
 using std::cerr;
 using std::endl;
 using global::avatar_dir;
@@ -61,3 +62,10 @@ const Image image::get(const string &digest, const uint16_t size)
 
     return { error, img };
 }
+
+void image::write(Image &image)
+{
+    cout << "Content-type: image/png\n\n";
+    cout.flush();   // We need to flush before we use /dev/stdout directly.
+    image.image.write("/dev/stdout");
+}

src/libravatarserv.cpp

@@ -54,16 +54,14 @@ int main()
 
     http::Request avatar = http::parse_request(request);
 
-    image::Image answer = image::get(avatar.digest, avatar.size);
-    if (answer.error == 0)
+    image::Image image = image::get(avatar.digest, avatar.size);
+    if (image.error == 0)
     {
-        cout << "Content-type: image/png\n\n";
-        cout.flush();   // We need to flush before we use /dev/stdout directly.
-        answer.image.write("/dev/stdout");
+        image::write(image);
     }
     else
     {
-        cerr << "Error " << std::to_string(answer.error) << ": Could not open file.\n";
+        cerr << "Error " << std::to_string(image.error) << ": Could not open file.\n";
         if (avatar.fallback.empty())
         {
             cout << "Status: 404 Not Found\n\n";
@@ -75,6 +73,22 @@ int main()
                 cout << "Status: 307 Temporary Redirect\n";
                 cout << "Location: " << avatar.fallback << endl << endl;
             }
+            else if (avatar.fallback.substr(0, 2) == "mp" ||
+                     avatar.fallback.substr(0, 2) == "mm")
+            {
+                // MD5 hash of 'mp'
+                image =  image::get("1f2dfa567dcf95833eddf7aec167fec7",
+                                    avatar.size);
+                if (image.error == 0)
+                {
+                    image::write(image);
+                }
+                else
+                {
+                    cout << "Status: 404 Not Found\n\n";
+                    cerr << "Mystery person not found.\n";
+                }
+            }
         }
     }
 

src/libravatarserv.hpp

@@ -69,11 +69,12 @@ namespace image // image.cpp
 {
     struct Image
     {
-        const uint8_t error;
+        uint8_t error;
         Magick::Image image;
     };
 
     const Image get(const string &digest, const uint16_t size);
+    void write(Image &image);
 }
 
 #endif  // LIBRAVATARSERV_HPP