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RRTcodebaseC

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}
char* dc_get_oauth2_access_token(dc_context_t* context, const char* addr,
const char* code, int flags)
{
oauth2_t* oauth2 = NULL;
char* access_token = NULL;
char* refresh_token = NULL;
char* refresh_token_for = NULL;
char* redirect_uri = NULL;
int update_redirect_uri_on_success = 0;
char* token_url = NULL;
time_t expires_in = 0;
char* error = NULL;
char* error_description = NULL;
char* json = NULL;
jsmn_parser parser;
jsmntok_t tok[128]; // we do not expect nor read more tokens
int tok_cnt = 0;
int locked = 0;
if (context==NULL || context->magic!=DC_CONTEXT_MAGIC
|| code==NULL || code[0]==0) {
dc_log_warning(context, 0, "Internal OAuth2 error");
goto cleanup;
}
if ((oauth2=get_info(addr))==NULL) {
dc_log_warning(context, 0, "Internal OAuth2 error: 2");
goto cleanup;
}
pthread_mutex_lock(&context->oauth2_critical);
locked = 1;
// read generated token
if ( !(flags&DC_REGENERATE) && !is_expired(context) ) {
access_token = dc_sqlite3_get_config(context->sql, "oauth2_access_token", NULL);
if (access_token!=NULL) {
goto cleanup; // success
}
}
// generate new token: build & call auth url
refresh_token = dc_sqlite3_get_config(context->sql, "oauth2_refresh_token", NULL);
refresh_token_for = dc_sqlite3_get_config(context->sql, "oauth2_refresh_token_for", "unset");
if (refresh_token==NULL || strcmp(refresh_token_for, code)!=0)
{
dc_log_info(context, 0, "Generate OAuth2 refresh_token and access_token...");
redirect_uri = dc_sqlite3_get_config(context->sql, "oauth2_pending_redirect_uri", "unset");
update_redirect_uri_on_success = 1;
token_url = dc_strdup(oauth2->init_token);
}
else
{
dc_log_info(context, 0, "Regenerate OAuth2 access_token by refresh_token...");
redirect_uri = dc_sqlite3_get_config(context->sql, "oauth2_redirect_uri", "unset");
token_url = dc_strdup(oauth2->refresh_token);
}
replace_in_uri(&token_url, "$CLIENT_ID", oauth2->client_id);
replace_in_uri(&token_url, "$REDIRECT_URI", redirect_uri);
replace_in_uri(&token_url, "$CODE", code);
replace_in_uri(&token_url, "$REFRESH_TOKEN", refresh_token);
json = (char*)context->cb(context, DC_EVENT_HTTP_POST, (uintptr_t)token_url, 0);
if (json==NULL) {
dc_log_warning(context, 0, "Error calling OAuth2 at %s", token_url);
goto cleanup;
}
// generate new token: parse returned json
jsmn_init(&parser);
tok_cnt = jsmn_parse(&parser, json, strlen(json), tok, sizeof(tok)/sizeof(tok[0]));
if (tok_cnt<2 || tok[0].type!=JSMN_OBJECT) {
dc_log_warning(context, 0, "Failed to parse OAuth2 json from %s", token_url);
goto cleanup;
}
for (int i = 1; i < tok_cnt; i++) {
if (access_token==NULL && jsoneq(json, &tok[i], "access_token")==0) {
access_token = jsondup(json, &tok[i+1]);
}
else if (refresh_token==NULL && jsoneq(json, &tok[i], "refresh_token")==0) {
refresh_token = jsondup(json, &tok[i+1]);
}
else if (jsoneq(json, &tok[i], "expires_in")==0) {
char* expires_in_str = jsondup(json, &tok[i+1]);
if (expires_in_str) {
time_t val = atol(expires_in_str);
// val should be reasonable, maybe between 20 seconds and 5 years.
// if out of range, we re-create when the token gets invalid,
// which may create some additional load and requests wrt threads.
if (val>20 && val<(60*60*24*365*5)) {
expires_in = val;
}
free(expires_in_str);
}
}