121 lines
3.0 KiB
C++
121 lines
3.0 KiB
C++
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#include "sds.h"
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#include <cstring>
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#include <unistd.h>
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#include <sys/types.h>
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#include <pwd.h>
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#include <sys/stat.h>
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#include "motd.h"
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/*------------------------------------------------------------------------------
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* Message of the day
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*--------------------------------------------------------------------------- */
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#ifdef MOTD
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#include <curl/curl.h>
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static const char *szMotdCachePath()
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{
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static sds sdsMotdCachePath = NULL;
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if (sdsMotdCachePath != NULL)
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return sdsMotdCachePath;
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struct passwd *pw = getpwuid(getuid());
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if (pw == NULL)
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return "";
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const char *homedir = pw->pw_dir;
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sdsMotdCachePath = sdsnew(homedir);
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sdsMotdCachePath = sdscat(sdsMotdCachePath, "/.keydb-cli-motd");
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return sdsMotdCachePath;
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}
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static size_t motd_write_callback(void *ptr, size_t size, size_t nmemb, sds *str)
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{
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*str = sdscatlen(*str, ptr, size*nmemb);
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return (size*nmemb);
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}
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static char *fetchMOTDFromCache()
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{
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struct stat attrib;
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if (stat(szMotdCachePath(), &attrib) != 0)
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return NULL;
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time_t t = attrib.st_mtim.tv_sec;
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time_t now = time(NULL);
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if ((now - t) < 14400)
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{
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// If our cache was updated no more than 4 hours ago use it instead of fetching the MOTD
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FILE *pf = fopen(szMotdCachePath(), "rb");
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if (pf == NULL)
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return NULL;
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fseek(pf, 0L, SEEK_END);
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long cb = ftell(pf);
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fseek(pf, 0L, SEEK_SET); // rewind
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sds str = sdsnewlen(NULL, cb);
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size_t cbRead = fread(str, 1, cb, pf);
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fclose(pf);
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if ((long)cbRead != cb)
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{
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sdsfree(str);
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return NULL;
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}
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return str;
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}
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return NULL;
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}
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static void setMOTDCache(const char *sz)
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{
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FILE *pf = fopen(szMotdCachePath(), "wb");
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if (pf == NULL)
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return;
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size_t celem = fwrite(sz, strlen(sz), 1, pf);
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(void)celem; // best effort
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fclose(pf);
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}
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extern "C" char *fetchMOTD(int cache)
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{
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sds str;
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CURL *curl;
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CURLcode res;
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/* First try and get the string from the cache */
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if (cache) {
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str = fetchMOTDFromCache();
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if (str != NULL)
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return str;
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}
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str = sdsnew("");
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curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "http://api.keydb.dev/motd/motd.txt");
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curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L); // follow redirects
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curl_easy_setopt(curl, CURLOPT_TIMEOUT, 2); // take no more than two seconds
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curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, motd_write_callback);
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curl_easy_setopt(curl, CURLOPT_WRITEDATA, &str);
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/* Perform the request, res will get the return code */
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res = curl_easy_perform(curl);
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/* Check for errors */
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if(res != CURLE_OK)
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{
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sdsfree(str);
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str = NULL;
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}
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/* always cleanup */
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curl_easy_cleanup(curl);
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if (str != NULL && cache)
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setMOTDCache(str);
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}
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return str;
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}
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#else
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extern "C" char *fetchMOTD(int /* cache */)
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{
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return NULL;
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}
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#endif
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