From 1bec937076d8d40f94ff4603479f21bca2de6c61 Mon Sep 17 00:00:00 2001
From: Julien Dessaux
Date: Sun, 4 Aug 2019 11:03:38 +0200
Subject: Added http lib and basic restapi with rocket_close_im binary

---
 common/http.c | 133 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 common/http.c

(limited to 'common/http.c')

diff --git a/common/http.c b/common/http.c
new file mode 100644
index 0000000..275a18f
--- /dev/null
+++ b/common/http.c
@@ -0,0 +1,133 @@
+#include <curl/curl.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "config.h"
+#include "http.h"
+#include "util.h"
+
+// Curl internal handling
+CURL* curl = NULL;
+struct curl_slist *headers = NULL;
+
+// Curl buffer handling
+char* buffer = NULL;
+size_t buffer_len = 0;
+size_t buffer_fill = 0;
+
+char initialized = 0;
+
+#define HEADER_SEP ": "
+
+static size_t writeCallback(char* buf, size_t size, size_t nmemb, void* userp);
+const char * http_perform(const char* path, const char* postfields);
+
+void http_add_header(const char* name, const char* value)
+{
+    if (!initialized) {
+        fprintf(stderr, "BUG: http_init wasn't called!\n");
+        return;
+    }
+
+    size_t name_len = strlen(name);
+    size_t sep_len = strlen(HEADER_SEP);
+    size_t value_len = strlen(value);
+    char* header = malloc(name_len + sep_len + value_len + 1);
+    strcpy(header, name);
+    strcpy(header + name_len, HEADER_SEP);
+    strcpy(header + name_len + sep_len, value);
+    headers = curl_slist_append(headers, header);
+    free(header);
+}
+
+void http_clean(void)
+{
+    if (!initialized)
+        return;
+    curl_slist_free_all(headers);
+    curl_easy_cleanup(curl);
+    curl = NULL;
+    curl_global_cleanup();
+    free(buffer);
+}
+
+const char * http_get(const char* path)
+{
+    curl_easy_setopt(curl, CURLOPT_POST, 0);
+    return http_perform(path, NULL);
+}
+
+void http_init(void)
+{
+    if (initialized) {
+        fprintf(stderr, "BUG: http_init already called!\n");
+        return;
+    }
+    curl_global_init(CURL_GLOBAL_ALL);
+    curl = curl_easy_init();
+    initialized = 1;
+}
+
+const char * http_perform(const char* path, const char* postfields)
+{
+    if (!initialized) {
+        fprintf(stderr, "BUG: http_init wasn't called!\n");
+        return NULL;
+    }
+
+    if (buffer != NULL) {
+        memset(buffer, 0, buffer_fill);
+        buffer_fill = 0;
+    }
+
+    curl_easy_reset(curl);
+    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &writeCallback);
+
+    const char * weburl = config_get_web_url();
+    size_t weburl_len = strlen(weburl);
+    size_t path_len = strlen(path);
+    char * url = malloc(weburl_len + path_len + 1);
+    strcpy(url, weburl);
+    strcpy(url + weburl_len, path);
+    curl_easy_setopt(curl, CURLOPT_URL, url);
+    free(url);
+    if (postfields != NULL)
+        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postfields);
+    if (headers != NULL)
+        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
+    CURLcode res = curl_easy_perform(curl);
+    if(res != CURLE_OK) {
+        fprintf(stderr, "HTTP get to %s failed: %s\n", url, curl_easy_strerror(res));
+        return NULL;
+    }
+
+    return buffer;
+}
+
+const char * http_post(const char* path, const char* postfields)
+{
+    if (postfields == NULL)
+        curl_easy_setopt(curl, CURLOPT_POST, 1);
+    return http_perform(path, postfields);
+}
+
+static size_t writeCallback(char* buf, size_t size, size_t nmemb, UNUSED void* userp)
+{   //callback must have this declaration
+    //buf is a pointer to the data that curl has for us
+    //size*nmemb is the size of the buffer
+
+    register size_t sn = size * nmemb;
+    if (buffer == NULL) {
+        buffer_len = sn;
+        buffer = malloc (buffer_len + 1);
+    } else if (buffer_fill + sn >= buffer_len) {
+        buffer_len += sn;
+        buffer = realloc(buffer, buffer_len + 1);
+    }
+    for (unsigned int c = 0; c < size * nmemb; ++c) {
+        buffer[buffer_fill + c] = buf[c];
+    }
+    buffer_fill += sn;
+    buffer[buffer_fill] = 0;
+    return sn; //tell curl how many bytes we handled
+}
-- 
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