Fix urldecoding on stripe side

wrenchboard/src/shared_tool/stripe.cc

@@ -2,6 +2,9 @@
 #include <cstdlib>
 #include <cstring>
 
+#include <algorithm>
+#include <string>
+
 #include <curl/curl.h>
 #include <pcrecpp.h> 
 #include <json-c/json.h>
@@ -686,6 +689,14 @@ long stripe_create_customer_parse(char *json, char *id, size_t id_size)
   return res;
 }
 
+bool replace(std::string& str, const std::string& from, const std::string& to) {
+    size_t start_pos = str.find(from);
+    if(start_pos == std::string::npos)
+        return false;
+    str.replace(start_pos, from.length(), to);
+    return true;
+}
+
 /*
 curl https://api.stripe.com/v1/customers \
    -u sk_test_MJYII1vrGGr7RrGw1lhYMiTq: \
@@ -712,9 +723,13 @@ long stripe_create_customer(const char *key, char *token, const char *email, con
 
   if(curl) { 
     bzero(post_fields, sizeof(post_fields));
+    // Patch email
+    std::string patched_email = email;
+    replace(patched_email, "+", "%2B"); // replace all '+' to '%2B' to avoid "urldecoding" on strip side
+   
     snprintf(post_fields, sizeof(post_fields), 
       "email=%s&description=%s&metadata[customer_id]=%s&source=%s", 
-      email, description, metadata, token);
+      patched_email.c_str(), description, metadata, token);
 
     /* Now specify the POST data */ 
     curl_easy_setopt(curl, CURLOPT_POSTFIELDS, post_fields);