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weechat-xmpp/slack-oauth.c

242 lines
6.6 KiB
C

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#include <stdlib.h>
#include <string.h>
#include <libwebsockets.h>
#include <json.h>
#include "weechat-plugin.h"
#include "slack.h"
#include "slack-oauth.h"
static void (*weechat_callback)(char *token);
static const char *const endpoint = "/api/oauth.access?"
"client_id=%s&client_secret=%s&code=%s";
static char *uri;
static int n = 0;
static struct lws *client_wsi = NULL;
static struct lws_context *context = NULL;
static struct t_hook *slack_oauth_hook_timer = NULL;
static inline int json_valid(json_object *object)
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{
if (!object)
{
weechat_printf(
NULL,
_("%s%s: error retrieving token: unexpected response from server"),
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weechat_prefix("error"), SLACK_PLUGIN_NAME);
return 0;
}
return 1;
}
static int callback_http(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
int status;
switch (reason)
{
/* because we are protocols[0] ... */
case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
weechat_printf(
NULL,
_("%s%s: error connecting to slack: %s"),
weechat_prefix("error"), SLACK_PLUGIN_NAME,
in ? (char *)in : "(null)");
client_wsi = NULL;
break;
case LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP:
status = lws_http_client_http_response(wsi);
weechat_printf(
NULL,
_("%s%s: retrieving token... (%d)"),
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weechat_prefix("network"), SLACK_PLUGIN_NAME,
status);
break;
/* chunks of chunked content, with header removed */
case LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ:
{
char *json_string = weechat_strndup(in, (int)len);
json_object *response, *ok, *error, *token;
weechat_printf(
NULL,
_("%s%s: got response: %s"),
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weechat_prefix("network"), SLACK_PLUGIN_NAME,
json_string);
response = json_tokener_parse(json_string);
ok = json_object_object_get(response, "ok");
if (!json_valid(ok))
{
json_object_put(response);
free(json_string);
return 0;
}
if(json_object_get_boolean(ok))
{
token = json_object_object_get(response, "access_token");
if (!json_valid(token))
{
json_object_put(response);
free(json_string);
return 0;
}
weechat_printf(
NULL,
_("%s%s: retrieved token: %s"),
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weechat_prefix("network"), SLACK_PLUGIN_NAME,
json_object_get_string(token));
weechat_callback(strdup(json_object_get_string(token)));
}
else
{
error = json_object_object_get(response, "error");
if (!json_valid(error))
{
json_object_put(response);
free(json_string);
return 0;
}
weechat_printf(
NULL,
_("%s%s: failed to retrieve token: %s"),
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weechat_prefix("error"), SLACK_PLUGIN_NAME,
json_object_get_string(error));
}
json_object_put(response);
free(json_string);
}
return 0; /* don't passthru */
/* uninterpreted http content */
case LWS_CALLBACK_RECEIVE_CLIENT_HTTP:
{
char buffer[1024 + LWS_PRE];
char *px = buffer + LWS_PRE;
int lenx = sizeof(buffer) - LWS_PRE;
if (lws_http_client_read(wsi, &px, &lenx) < 0)
return -1;
}
return 0; /* don't passthru */
case LWS_CALLBACK_COMPLETED_CLIENT_HTTP:
case LWS_CALLBACK_CLOSED_CLIENT_HTTP:
client_wsi = NULL;
/* Does not doing this cause a leak?
lws_cancel_service(lws_get_context(wsi));*/ /* abort poll wait */
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break;
default:
break;
}
return lws_callback_http_dummy(wsi, reason, user, in, len);
}
static const struct lws_protocols protocols[] = {
{
"http",
callback_http,
0,
0,
},
{ NULL, NULL, 0, 0 }
};
int slack_oauth_timer_cb(const void *pointer, void *data, int remaining_calls)
{
(void) pointer;
(void) data;
(void) remaining_calls;
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if (n >= 0 && client_wsi)
{
n = lws_service(context, 0);
}
else if (context)
{
lws_context_destroy(context);
context = NULL;
free(uri);
if (slack_oauth_hook_timer)
weechat_unhook(slack_oauth_hook_timer);
}
return WEECHAT_RC_OK;
}
void slack_oauth_request_token(char *code, void (*callback)(char *token))
{
struct lws_context_creation_info info;
struct lws_client_connect_info i;
if (client_wsi)
{
weechat_printf(
NULL,
_("%s%s: error: a registration is already in progress"),
weechat_prefix("error"), SLACK_PLUGIN_NAME);
return;
}
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size_t urilen = snprintf(NULL, 0, endpoint, SLACK_CLIENT_ID, SLACK_CLIENT_SECRET, code) + 1;
uri = malloc(urilen);
snprintf(uri, urilen, endpoint, SLACK_CLIENT_ID, SLACK_CLIENT_SECRET, code);
memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
info.port = CONTEXT_PORT_NO_LISTEN; /* we do not run any server */
info.protocols = protocols;
context = lws_create_context(&info);
if (!context)
{
weechat_printf(
NULL,
_("%s%s: error connecting to slack: lws init failed"),
weechat_prefix("error"), SLACK_PLUGIN_NAME);
return;
}
else
{
weechat_printf(
NULL,
_("%s%s: contacting slack.com:443"),
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weechat_prefix("network"), SLACK_PLUGIN_NAME);
}
memset(&i, 0, sizeof i); /* otherwise uninitialized garbage */
i.context = context;
i.ssl_connection = LCCSCF_USE_SSL;
i.port = 443;
i.address = "slack.com";
i.path = uri;
i.host = i.address;
i.origin = i.address;
i.method = "GET";
i.protocol = protocols[0].name;
i.pwsi = &client_wsi;
lws_client_connect_via_info(&i);
slack_oauth_hook_timer = weechat_hook_timer(1 * 1000, 0, 0,
&slack_oauth_timer_cb,
NULL, NULL);
weechat_callback = callback;
}