add api/version call

https://github.com/moneroexamples/openmonero/issues/35

README.md

@@ -716,6 +716,27 @@ curl  -w "\n" -X GET "http://139.162.32.245:8081/api/emission"
 
 Emission only works when the emission monitoring thread is enabled.
 
+#### api/version
+
+```bash
+curl  -w "\n" -X GET "http://139.162.32.245:8081/api/version"
+```
+
+```json
+{
+  "data": {
+    "api": 65536, 
+    "blockchain_height": 1357031,
+    "git_branch_name": "update_to_current_monero",
+    "last_git_commit_date": "2017-07-25",
+    "last_git_commit_hash": "a549f25",
+    "monero_version_full": "0.10.3.1-ab594cfe"
+  },
+  "status": "success"
+}
+```
+
+api number is store as `uint32_t`. 
 
 #### api/rawblock/<block_number|block_hash>
 

main.cpp

@@ -592,6 +592,14 @@ main(int ac, const char* av[])
             return r;
         });
 
+        CROW_ROUTE(app, "/api/version")
+        ([&](const crow::request &req) {
+
+            myxmr::jsonresponse r{xmrblocks.json_version()};
+
+            return r;
+        });
+
     }
 
     if (enable_autorefresh_option)

src/page.h

@@ -55,6 +55,11 @@
 #define TMPL_MY_CHECKRAWOUTPUTKEYS  TMPL_DIR "/checkrawoutputkeys.html"
 
 
+#define ONIONEXPLORER_RPC_VERSION_MAJOR 1
+#define ONIONEXPLORER_RPC_VERSION_MINOR 0
+#define MAKE_ONIONEXPLORER_RPC_VERSION(major,minor) (((major)<<16)|(minor))
+#define ONIONEXPLORER_RPC_VERSION \
+    MAKE_ONIONEXPLORER_RPC_VERSION(ONIONEXPLORER_RPC_VERSION_MAJOR, ONIONEXPLORER_RPC_VERSION_MINOR)
 
 
 // basic info about tx to be stored in cashe.
@@ -4937,6 +4942,35 @@ namespace xmreg
         }
 
 
+        /*
+              * Lets use this json api convention for success and error
+              * https://labs.omniti.com/labs/jsend
+              */
+        json
+        json_version()
+        {
+            json j_response {
+                    {"status", "fail"},
+                    {"data",   json {}}
+            };
+
+            json& j_data = j_response["data"];
+
+            j_data = json {
+                    {"last_git_commit_hash", string {GIT_COMMIT_HASH}},
+                    {"last_git_commit_date", string {GIT_COMMIT_DATETIME}},
+                    {"git_branch_name"     , string {GIT_BRANCH_NAME}},
+                    {"monero_version_full" , string {MONERO_VERSION_FULL}},
+                    {"api"                 , ONIONEXPLORER_RPC_VERSION},
+                    {"blockchain_height"   , core_storage->get_current_blockchain_height()}
+            };
+
+            j_response["status"]  = "success";
+
+            return j_response;
+        }
+
+
     private:
 
 
@@ -5884,7 +5918,10 @@ namespace xmreg
                     {"last_git_commit_hash", string {GIT_COMMIT_HASH}},
                     {"last_git_commit_date", string {GIT_COMMIT_DATETIME}},
                     {"git_branch_name"     , string {GIT_BRANCH_NAME}},
-                    {"monero_version_full" , string {MONERO_VERSION_FULL}}
+                    {"monero_version_full" , string {MONERO_VERSION_FULL}},
+                    {"api"                 , std::to_string(ONIONEXPLORER_RPC_VERSION_MAJOR)
+                                             + "."
+                                             + std::to_string(ONIONEXPLORER_RPC_VERSION_MINOR)},
             };
 
             string footer_html = mstch::render(xmreg::read(TMPL_FOOTER), footer_context);

src/templates/footer.html

@@ -1,7 +1,7 @@
 <div class="center">
     <h6 style="margin-top:10px">
         <a href="https://github.com/moneroexamples/onion-monero-blockchain-explorer">source code</a>
-        | explorer version: {{git_branch_name}}-{{last_git_commit_date}}-{{last_git_commit_hash}}
+        | explorer version (api): {{git_branch_name}}-{{last_git_commit_date}}-{{last_git_commit_hash}} ({{api}})
         | monero version: {{monero_version_full}}
     </h6>
 </div>