commit 64d7798ca90834e633fcde18281e8684d18c1a84
Author: beep <beep@wimdupont.com>
Date: Sat, 4 Apr 2026 14:48:05 +0000
Initial discordc import
Diffstat:
14 files changed, 1468 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,5 @@
+config.h
+bin/
+obj/
+*.o
+*.d
diff --git a/LICENSE b/LICENSE
@@ -0,0 +1,674 @@
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+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+ 17. Interpretation of Sections 15 and 16.
+
+ If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) 2024 Wim Dupont
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) 2024 Wim Dupont
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/Makefile b/Makefile
@@ -0,0 +1,43 @@
+include config.mk
+
+BIN = discordc
+SRC = src/discordc.c src/discordapi.c src/discordjson.c src/timeutil.c
+OBJ = ${SRC:src/%.c=obj/%.o}
+DEP = ${OBJ:.o=.d}
+MAN1 = ${BIN:=.1}
+TARGET = bin/${BIN}
+
+all: ${TARGET}
+
+obj bin:
+ mkdir -p $@
+
+obj/%.o: src/%.c config.h | obj
+ $(CC) -g -MMD -MP -I. -c $(CFLAGS) -o $@ $<
+
+${TARGET}: ${OBJ} | bin
+ ${CC} -g -o $@ ${OBJ} ${LDFLAGS}
+
+config.h:
+ cp config.def.h $@
+
+clean:
+ rm -f ${TARGET} ${OBJ} ${DEP}
+ rm -f discordc *.o
+
+install: all
+ mkdir -p ${DESTDIR}${PREFIX}/bin
+ cp -f ${TARGET} "${DESTDIR}${PREFIX}/bin/${BIN}"
+ chmod 755 "${DESTDIR}${PREFIX}/bin/${BIN}"
+ mkdir -p "${DESTDIR}${MANPREFIX}/man1"
+ sed "s/VERSION/${VERSION}/g" < ${MAN1} > "${DESTDIR}${MANPREFIX}/man1/${MAN1}"
+ chmod 644 "${DESTDIR}${MANPREFIX}/man1/${MAN1}"
+
+uninstall:
+ rm -f \
+ "${DESTDIR}${PREFIX}/bin/${BIN}"\
+ "${DESTDIR}${MANPREFIX}/man1/${MAN1}"
+
+-include ${DEP}
+
+.PHONY: all clean install uninstall obj bin
diff --git a/README.adoc b/README.adoc
@@ -0,0 +1,38 @@
+= discordc
+C Discord ping bot
+
+Small Discord Gateway bot for one Discord text channel.
+
+When a non-bot message in that channel is exactly `ping`, `discordc` replies
+with `pong <latency> ms`.
+
+== Configuration
+
+Copy `config.def.h` to `config.h` and set `discord_bot_token` and
+`discord_channel_id`.
+
+The bot needs `Send Messages` and `Read Message History` in that channel, plus
+`Message Content Intent` enabled in Discord Developer Portal -> Bot.
+
+Invite URL for this bot:
+
+[source,text]
+----
+https://discord.com/oauth2/authorize?client_id=1489725985581695057&scope=bot&permissions=3072
+----
+
+This program uses plain C with `libcurl` and `cJSON`, but no Discord SDK.
+
+== Installation
+
+[source,bash]
+----
+$ make clean install
+----
+
+== Run
+
+[source,bash]
+----
+$ ./bin/discordc
+----
diff --git a/config.def.h b/config.def.h
@@ -0,0 +1,6 @@
+static char *discord_bot_token = "";
+static char *discord_channel_id = "";
+static char *discord_api_base = "https://discord.com/api/v10";
+static char *discord_gateway_url = "wss://gateway.discord.gg/?v=10&encoding=json";
+static char *discord_user_agent = "discordc/VERSION";
+static int discord_intents = 33280;
diff --git a/config.mk b/config.mk
@@ -0,0 +1,12 @@
+NAME = discordc
+
+VERSION = 0.1
+
+CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700L -DVERSION=\"${VERSION}\"
+CFLAGS = -std=c99 -pedantic -Wall -Wextra -I/usr/local/include ${CPPFLAGS}
+LDFLAGS = -lcurl -lcjson
+
+PREFIX = /usr/local
+MANPREFIX = ${PREFIX}/share/man
+
+CC = gcc
diff --git a/discordc.1 b/discordc.1
@@ -0,0 +1,17 @@
+.TH DISCORDC 1 discordc\-VERSION
+.SH NAME
+discordc \- small Discord ping bot
+.SH SYNOPSIS
+.B discordc
+.SH DESCRIPTION
+.B discordc
+polls one Discord channel for the newest message and replies with
+.B pong <latency> ms
+when that message is exactly
+.BR ping .
+.SH CONFIGURATION
+Edit
+.B config.h
+to set the bot token, channel id, API base URL, user agent, and poll interval.
+.SH SEE ALSO
+.BR curl (1)
diff --git a/src/discordapi.c b/src/discordapi.c
@@ -0,0 +1,206 @@
+#include <curl/curl.h>
+#include <curl/websockets.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "discordapi.h"
+
+#define REQUEST_MAX 1024
+#define AUTH_MAX 256
+
+typedef struct
+{
+ char *response;
+ size_t size;
+} Memory;
+
+static size_t writefunc(char *data, size_t size, size_t nmemb, Memory *mem);
+
+void
+discordapi_init(void)
+{
+ curl_global_init(CURL_GLOBAL_DEFAULT);
+}
+
+void
+discordapi_cleanup(void)
+{
+ curl_global_cleanup();
+}
+
+int
+discordapi_gateway_open(DiscordGateway *gateway, const char *gateway_url,
+ const char *user_agent)
+{
+ CURL *ws = curl_easy_init();
+ CURLcode res;
+
+ gateway->ws = NULL;
+ if (ws == NULL)
+ return -1;
+
+ curl_easy_setopt(ws, CURLOPT_URL, gateway_url);
+ curl_easy_setopt(ws, CURLOPT_USERAGENT, user_agent);
+ curl_easy_setopt(ws, CURLOPT_CONNECT_ONLY, 2L);
+
+ res = curl_easy_perform(ws);
+ if (res != CURLE_OK) {
+ fprintf(stderr, "curl_easy_perform() failed: %s\n",
+ curl_easy_strerror(res));
+ curl_easy_cleanup(ws);
+ return -1;
+ }
+
+ gateway->ws = ws;
+ return 0;
+}
+
+void
+discordapi_gateway_close(DiscordGateway *gateway)
+{
+ if (gateway->ws != NULL)
+ curl_easy_cleanup(gateway->ws);
+ gateway->ws = NULL;
+}
+
+DiscordApiRecvStatus
+discordapi_gateway_recv(DiscordGateway *gateway, char *buf, size_t bufsize,
+ unsigned int *close_code, char *close_reason,
+ size_t reason_size)
+{
+ const struct curl_ws_frame *meta;
+ size_t nread, len;
+ CURL *ws = gateway->ws;
+ CURLcode res;
+
+ if (bufsize == 0 || ws == NULL)
+ return DISCORDAPI_RECV_ERROR;
+
+ res = curl_ws_recv(ws, buf, bufsize - 1, &nread, &meta);
+ if (res == CURLE_AGAIN)
+ return DISCORDAPI_RECV_NONE;
+ if (res != CURLE_OK) {
+ fprintf(stderr, "curl_ws_recv() failed: %s\n",
+ curl_easy_strerror(res));
+ return DISCORDAPI_RECV_ERROR;
+ }
+ if (meta != NULL && (meta->flags & CURLWS_CLOSE)) {
+ *close_code = 0;
+ if (reason_size > 0)
+ close_reason[0] = '\0';
+ if (nread >= 2) {
+ *close_code = ((unsigned char)buf[0] << 8)
+ | (unsigned char)buf[1];
+ if (reason_size > 0) {
+ len = nread - 2 < reason_size - 1
+ ? nread - 2 : reason_size - 1;
+ memcpy(close_reason, buf + 2, len);
+ close_reason[len] = '\0';
+ }
+ }
+ return DISCORDAPI_RECV_CLOSED;
+ }
+ if (meta == NULL || !(meta->flags & (CURLWS_TEXT | CURLWS_CONT)))
+ return DISCORDAPI_RECV_NONE;
+
+ len = nread;
+ while (meta->bytesleft > 0 && len < bufsize - 1) {
+ res = curl_ws_recv(ws, buf + len, bufsize - 1 - len, &nread, &meta);
+ if (res != CURLE_OK)
+ return DISCORDAPI_RECV_ERROR;
+ len += nread;
+ }
+ buf[len] = '\0';
+
+ return DISCORDAPI_RECV_PAYLOAD;
+}
+
+int
+discordapi_gateway_send(DiscordGateway *gateway, const char *json_string)
+{
+ size_t sent = 0, nsent, len = strlen(json_string);
+ CURL *ws = gateway->ws;
+ CURLcode res;
+
+ if (ws == NULL)
+ return -1;
+
+ while (sent < len) {
+ res = curl_ws_send(ws, json_string + sent, len - sent, &nsent, 0,
+ CURLWS_TEXT);
+ if (res == CURLE_OK)
+ sent += nsent;
+ else if (res == CURLE_AGAIN)
+ usleep(50000);
+ else {
+ fprintf(stderr, "curl_ws_send() failed: %s\n",
+ curl_easy_strerror(res));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+int
+discordapi_post_message(const char *api_base, const char *channel_id,
+ const char *bot_token, const char *user_agent,
+ const char *json_string)
+{
+ char request[REQUEST_MAX], authorization[AUTH_MAX];
+ struct curl_slist *headers = NULL;
+ Memory mem = {0};
+ CURL *curl = curl_easy_init();
+ CURLcode res;
+
+ if (curl == NULL)
+ return -1;
+
+ snprintf(request, sizeof(request), "%s/channels/%s/messages",
+ api_base, channel_id);
+ snprintf(authorization, sizeof(authorization), "Authorization: Bot %s",
+ bot_token);
+
+ headers = curl_slist_append(headers, authorization);
+ headers = curl_slist_append(headers, "Content-Type: application/json");
+ headers = curl_slist_append(headers, "charset: utf-8");
+
+ curl_easy_setopt(curl, CURLOPT_URL, request);
+ curl_easy_setopt(curl, CURLOPT_COOKIEFILE, "");
+ curl_easy_setopt(curl, CURLOPT_USERAGENT, user_agent);
+ curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
+ curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writefunc);
+ curl_easy_setopt(curl, CURLOPT_WRITEDATA, &mem);
+ curl_easy_setopt(curl, CURLOPT_POSTFIELDS, json_string);
+
+ res = curl_easy_perform(curl);
+ if (res != CURLE_OK)
+ fprintf(stderr, "curl_easy_perform() failed: %s\n",
+ curl_easy_strerror(res));
+
+ free(mem.response);
+ curl_slist_free_all(headers);
+ curl_easy_cleanup(curl);
+
+ return res == CURLE_OK ? 0 : -1;
+}
+
+size_t
+writefunc(char *data, size_t size, size_t nmemb, Memory *mem)
+{
+ char *ptr;
+ size_t realsize = size * nmemb;
+
+ if ((ptr = realloc(mem->response, mem->size + realsize + 1)) == NULL)
+ return 0;
+
+ mem->response = ptr;
+ memcpy(&(mem->response[mem->size]), data, realsize);
+ mem->size += realsize;
+ mem->response[mem->size] = 0;
+
+ return realsize;
+}
diff --git a/src/discordapi.h b/src/discordapi.h
@@ -0,0 +1,32 @@
+#ifndef DISCORDAPI_H
+#define DISCORDAPI_H
+
+#include <stddef.h>
+
+typedef struct
+{
+ void *ws;
+} DiscordGateway;
+
+typedef enum
+{
+ DISCORDAPI_RECV_ERROR = -1,
+ DISCORDAPI_RECV_NONE = 0,
+ DISCORDAPI_RECV_PAYLOAD = 1,
+ DISCORDAPI_RECV_CLOSED = 2
+} DiscordApiRecvStatus;
+
+void discordapi_init(void);
+void discordapi_cleanup(void);
+int discordapi_gateway_open(DiscordGateway *gateway, const char *gateway_url,
+ const char *user_agent);
+void discordapi_gateway_close(DiscordGateway *gateway);
+DiscordApiRecvStatus discordapi_gateway_recv(DiscordGateway *gateway,
+ char *buf, size_t bufsize, unsigned int *close_code,
+ char *close_reason, size_t reason_size);
+int discordapi_gateway_send(DiscordGateway *gateway, const char *json_string);
+int discordapi_post_message(const char *api_base, const char *channel_id,
+ const char *bot_token, const char *user_agent,
+ const char *json_string);
+
+#endif
diff --git a/src/discordc.c b/src/discordc.c
@@ -0,0 +1,175 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "config.h"
+#include "discordapi.h"
+#include "discordjson.h"
+#include "timeutil.h"
+
+#define EVENT_MAX 262144
+#define CLOSE_REASON_MAX 256
+
+static void run_bot(void);
+static void handle_gateway_payload(DiscordGateway *gateway,
+ const char *payload, long *seq, long *heartbeat_ms,
+ struct timespec *next_heartbeat, char *lastid);
+static void send_identify(DiscordGateway *gateway);
+static void send_heartbeat(DiscordGateway *gateway, const long seq);
+static void send_pong(const long latency);
+static char * cpstr(char *dest, const char *src);
+
+int
+main(void)
+{
+ if (discord_bot_token[0] == '\0') {
+ fprintf(stderr, "Empty discord_bot_token in config.h\n");
+ return EXIT_FAILURE;
+ }
+ if (discord_channel_id[0] == '\0') {
+ fprintf(stderr, "Empty discord_channel_id in config.h\n");
+ return EXIT_FAILURE;
+ }
+
+ discordapi_init();
+ run_bot();
+ discordapi_cleanup();
+
+ return EXIT_SUCCESS;
+}
+
+void
+run_bot(void)
+{
+ char payload[EVENT_MAX], close_reason[CLOSE_REASON_MAX], lastid[ID_MAX] = "";
+ unsigned int close_code;
+ long seq = -1, heartbeat_ms = 0;
+ struct timespec next_heartbeat = {0};
+ DiscordGateway gateway;
+ DiscordApiRecvStatus status;
+
+ if (discordapi_gateway_open(&gateway, discord_gateway_url,
+ discord_user_agent) != 0) {
+ fprintf(stderr, "Failed to connect Discord Gateway\n");
+ return;
+ }
+
+ for (;;) {
+ if (heartbeat_ms > 0 && heartbeat_due(&next_heartbeat)) {
+ send_heartbeat(&gateway, seq);
+ schedule_heartbeat(&next_heartbeat, heartbeat_ms);
+ }
+
+ status = discordapi_gateway_recv(&gateway, payload, sizeof(payload),
+ &close_code, close_reason, sizeof(close_reason));
+ if (status == DISCORDAPI_RECV_NONE) {
+ usleep(50000);
+ continue;
+ }
+ if (status == DISCORDAPI_RECV_ERROR)
+ break;
+ if (status == DISCORDAPI_RECV_CLOSED) {
+ fprintf(stderr, "Gateway closed connection: %u %s\n",
+ close_code, close_reason);
+ if (close_code == 4014)
+ fprintf(stderr, "Enable Message Content Intent in "
+ "Discord Developer Portal -> Bot\n");
+ break;
+ }
+
+ handle_gateway_payload(&gateway, payload, &seq, &heartbeat_ms,
+ &next_heartbeat, lastid);
+ }
+
+ discordapi_gateway_close(&gateway);
+}
+
+void
+handle_gateway_payload(DiscordGateway *gateway, const char *payload,
+ long *seq, long *heartbeat_ms,
+ struct timespec *next_heartbeat, char *lastid)
+{
+ DiscordEvent event;
+
+ if (!parse_gateway_json(payload, &event))
+ return;
+ if (event.seq >= 0)
+ *seq = event.seq;
+ if (event.heartbeat_ms > 0) {
+ *heartbeat_ms = event.heartbeat_ms;
+ send_identify(gateway);
+ send_heartbeat(gateway, *seq);
+ schedule_heartbeat(next_heartbeat, *heartbeat_ms);
+ }
+ if (event.heartbeat_requested) {
+ send_heartbeat(gateway, *seq);
+ schedule_heartbeat(next_heartbeat, *heartbeat_ms);
+ }
+ if (event.has_message
+ && strcmp(event.channel_id, discord_channel_id) == 0
+ && strcmp(event.content, "ping") == 0
+ && strcmp(event.message_id, lastid) != 0) {
+ cpstr(lastid, event.message_id);
+ send_pong(parse_latency(event.timestamp));
+ }
+}
+
+void
+send_identify(DiscordGateway *gateway)
+{
+ char *json_string = build_identify_json(discord_bot_token,
+ discord_intents);
+
+ if (json_string == NULL) {
+ fprintf(stderr, "Failed to build identify payload\n");
+ return;
+ }
+
+ discordapi_gateway_send(gateway, json_string);
+ free(json_string);
+}
+
+void
+send_heartbeat(DiscordGateway *gateway, const long seq)
+{
+ char *json_string = build_heartbeat_json(seq);
+
+ if (json_string == NULL) {
+ fprintf(stderr, "Failed to build heartbeat payload\n");
+ return;
+ }
+
+ discordapi_gateway_send(gateway, json_string);
+ free(json_string);
+}
+
+void
+send_pong(const long latency)
+{
+ char pong[64];
+ char *json_string;
+
+ snprintf(pong, sizeof(pong), "pong %ld ms", latency);
+ if ((json_string = build_message_json(pong)) == NULL) {
+ fprintf(stderr, "Failed to build message payload\n");
+ return;
+ }
+
+ discordapi_post_message(discord_api_base, discord_channel_id,
+ discord_bot_token, discord_user_agent, json_string);
+ free(json_string);
+}
+
+char *
+cpstr(char *dest, const char *src)
+{
+ size_t cplen = strlen(src);
+
+ memcpy(dest, src, cplen);
+ dest[cplen] = '\0';
+
+ return dest;
+}
diff --git a/src/discordjson.c b/src/discordjson.c
@@ -0,0 +1,160 @@
+#include <cjson/cJSON.h>
+#include <stdbool.h>
+#include <string.h>
+
+#include "discordjson.h"
+
+static bool parse_message_create(cJSON *data, DiscordEvent *event);
+static char * cpstr(char *dest, const char *src);
+
+char *
+build_identify_json(const char *token, const int intents)
+{
+ cJSON *json = cJSON_CreateObject();
+ cJSON *data = cJSON_CreateObject();
+ cJSON *props = cJSON_CreateObject();
+ char *json_string;
+
+ if (json == NULL || data == NULL || props == NULL) {
+ cJSON_Delete(json);
+ cJSON_Delete(data);
+ cJSON_Delete(props);
+ return NULL;
+ }
+
+ cJSON_AddNumberToObject(json, "op", 2);
+ cJSON_AddItemToObject(json, "d", data);
+ cJSON_AddStringToObject(data, "token", token);
+ cJSON_AddNumberToObject(data, "intents", intents);
+ cJSON_AddItemToObject(data, "properties", props);
+ cJSON_AddStringToObject(props, "os", "linux");
+ cJSON_AddStringToObject(props, "browser", "discordc");
+ cJSON_AddStringToObject(props, "device", "discordc");
+
+ json_string = cJSON_PrintUnformatted(json);
+ cJSON_Delete(json);
+
+ return json_string;
+}
+
+char *
+build_heartbeat_json(const long seq)
+{
+ cJSON *json = cJSON_CreateObject();
+ char *json_string;
+
+ if (json == NULL)
+ return NULL;
+
+ cJSON_AddNumberToObject(json, "op", 1);
+ if (seq >= 0)
+ cJSON_AddNumberToObject(json, "d", seq);
+ else
+ cJSON_AddNullToObject(json, "d");
+
+ json_string = cJSON_PrintUnformatted(json);
+ cJSON_Delete(json);
+
+ return json_string;
+}
+
+char *
+build_message_json(const char *content)
+{
+ cJSON *json = cJSON_CreateObject();
+ char *json_string;
+
+ if (json == NULL)
+ return NULL;
+
+ cJSON_AddStringToObject(json, "content", content);
+ json_string = cJSON_PrintUnformatted(json);
+ cJSON_Delete(json);
+
+ return json_string;
+}
+
+bool
+parse_gateway_json(const char *payload, DiscordEvent *event)
+{
+ cJSON *json = cJSON_Parse(payload);
+ cJSON *op, *seq, *type, *data, *interval;
+
+ memset(event, 0, sizeof(*event));
+ event->op = -1;
+ event->seq = -1;
+
+ if (json == NULL)
+ return false;
+
+ op = cJSON_GetObjectItem(json, "op");
+ seq = cJSON_GetObjectItem(json, "s");
+ type = cJSON_GetObjectItem(json, "t");
+ data = cJSON_GetObjectItem(json, "d");
+
+ if (cJSON_IsNumber(op))
+ event->op = op->valueint;
+ if (cJSON_IsNumber(seq))
+ event->seq = (long) seq->valuedouble;
+
+ if (event->op == 10 && cJSON_IsObject(data)) {
+ interval = cJSON_GetObjectItem(data, "heartbeat_interval");
+ if (cJSON_IsNumber(interval))
+ event->heartbeat_ms = (long) interval->valuedouble;
+ } else if (event->op == 1) {
+ event->heartbeat_requested = true;
+ } else if (event->op == 0 && cJSON_IsString(type)
+ && type->valuestring != NULL
+ && strcmp(type->valuestring, "READY") == 0) {
+ event->ready = true;
+ } else if (event->op == 0 && cJSON_IsString(type)
+ && type->valuestring != NULL
+ && strcmp(type->valuestring, "MESSAGE_CREATE") == 0
+ && cJSON_IsObject(data)) {
+ parse_message_create(data, event);
+ }
+
+ cJSON_Delete(json);
+
+ return true;
+}
+
+bool
+parse_message_create(cJSON *data, DiscordEvent *event)
+{
+ cJSON *id = cJSON_GetObjectItem(data, "id");
+ cJSON *channel_id = cJSON_GetObjectItem(data, "channel_id");
+ cJSON *content = cJSON_GetObjectItem(data, "content");
+ cJSON *timestamp = cJSON_GetObjectItem(data, "timestamp");
+ cJSON *author = cJSON_GetObjectItem(data, "author");
+ cJSON *bot = author ? cJSON_GetObjectItem(author, "bot") : NULL;
+
+ if (!cJSON_IsString(id) || id->valuestring == NULL
+ || !cJSON_IsString(channel_id)
+ || channel_id->valuestring == NULL
+ || !cJSON_IsString(content)
+ || content->valuestring == NULL)
+ return false;
+ if (cJSON_IsBool(bot) && cJSON_IsTrue(bot))
+ return false;
+
+ cpstr(event->message_id, id->valuestring);
+ cpstr(event->channel_id, channel_id->valuestring);
+ cpstr(event->content, content->valuestring);
+ if (cJSON_IsString(timestamp) && timestamp->valuestring != NULL)
+ cpstr(event->timestamp, timestamp->valuestring);
+ event->has_message = true;
+
+ return true;
+}
+
+char *
+cpstr(char *dest, const char *src)
+{
+ size_t cplen = strlen(src);
+
+ memcpy(dest, src, cplen);
+ dest[cplen] = '\0';
+
+ return dest;
+}
diff --git a/src/discordjson.h b/src/discordjson.h
@@ -0,0 +1,28 @@
+#ifndef DISCORDJSON_H
+#define DISCORDJSON_H
+
+#include <stdbool.h>
+
+#define ID_MAX 64
+#define DISCORD_MESSAGE_MAX 256
+
+typedef struct
+{
+ int op;
+ long seq;
+ long heartbeat_ms;
+ bool heartbeat_requested;
+ bool ready;
+ bool has_message;
+ char message_id[ID_MAX];
+ char channel_id[ID_MAX];
+ char content[DISCORD_MESSAGE_MAX];
+ char timestamp[64];
+} DiscordEvent;
+
+char * build_identify_json(const char *token, const int intents);
+char * build_heartbeat_json(const long seq);
+char * build_message_json(const char *content);
+bool parse_gateway_json(const char *json_string, DiscordEvent *event);
+
+#endif
diff --git a/src/timeutil.c b/src/timeutil.c
@@ -0,0 +1,60 @@
+#include <stdbool.h>
+#include <string.h>
+#include <time.h>
+
+#include "timeutil.h"
+
+long
+parse_latency(const char *timestamp)
+{
+ struct tm tm;
+ struct timespec now;
+ const char *frac;
+ long millis = 0;
+ time_t sent;
+
+ if (timestamp == NULL || timestamp[0] == '\0')
+ return 0;
+
+ memset(&tm, 0, sizeof(tm));
+ if ((frac = strptime(timestamp, "%Y-%m-%dT%H:%M:%S", &tm)) == NULL)
+ return 0;
+
+ if (*frac == '.') {
+ for (int i = 1; i <= 3 && frac[i] >= '0' && frac[i] <= '9'; i++)
+ millis = millis * 10 + (frac[i] - '0');
+ while (millis > 0 && millis < 100)
+ millis *= 10;
+ }
+
+ if ((sent = timegm(&tm)) == (time_t)-1)
+ return 0;
+ if (clock_gettime(CLOCK_REALTIME, &now) != 0)
+ return 0;
+
+ return (now.tv_sec - sent) * 1000L + (now.tv_nsec / 1000000L) - millis;
+}
+
+void
+schedule_heartbeat(struct timespec *next_heartbeat, const long heartbeat_ms)
+{
+ clock_gettime(CLOCK_MONOTONIC, next_heartbeat);
+ next_heartbeat->tv_sec += heartbeat_ms / 1000;
+ next_heartbeat->tv_nsec += (heartbeat_ms % 1000) * 1000000L;
+ if (next_heartbeat->tv_nsec >= 1000000000L) {
+ next_heartbeat->tv_sec++;
+ next_heartbeat->tv_nsec -= 1000000000L;
+ }
+}
+
+bool
+heartbeat_due(const struct timespec *next_heartbeat)
+{
+ struct timespec now;
+
+ clock_gettime(CLOCK_MONOTONIC, &now);
+
+ return now.tv_sec > next_heartbeat->tv_sec
+ || (now.tv_sec == next_heartbeat->tv_sec
+ && now.tv_nsec >= next_heartbeat->tv_nsec);
+}
diff --git a/src/timeutil.h b/src/timeutil.h
@@ -0,0 +1,12 @@
+#ifndef TIMEUTIL_H
+#define TIMEUTIL_H
+
+#include <stdbool.h>
+#include <time.h>
+
+long parse_latency(const char *timestamp);
+void schedule_heartbeat(struct timespec *next_heartbeat,
+ const long heartbeat_ms);
+bool heartbeat_due(const struct timespec *next_heartbeat);
+
+#endif
