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241 lines
5.3 KiB
C
241 lines
5.3 KiB
C
#include "inbox.h"
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// Submodules
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#include "http_server/http_request.h"
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#include "json/json.h"
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#include "ffdb/fs_list.h"
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// Model
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#include "model/server.h"
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#include "model/account.h"
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#include "model/ap/activity.h"
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#include "model/ap/inbox_envelope.h"
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#include "model/crypto/http_sign.h"
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// Stdlib
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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extern bool terminate;
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bool route_inbox( struct http_request* req )
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{
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// No subroutes
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if( !http_request_route_term( req, "" ) ) { return false; }
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if( !http_request_route_method( req, "POST" ) ) { return false; }
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if( envelope_create_from_request( req ) ) {
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http_request_send_headers( req, 200, "text/plain", true );
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} else {
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http_request_send_headers( req, 400, "text/plain", true );
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}
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return true;
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}
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bool route_undo_activity( struct ap_activity* act )
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{
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if( act->object.tag != apaot_activity ) {
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// Don't undo activities that are references
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return false;
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}
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if( !act->object.ptr ) {
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printf( "No object in activity\n" );
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return false;
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}
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switch( act->object.ptr->type ) {
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case apat_follow:
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const char* target = act->object.ptr->object.ref;
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struct account* a = account_from_uri( target );
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if( !a || 0 != strcmp( a->server, g_server_name ) ) {
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printf( "Unfollow not targeted at local account. Discarding.\n" );
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return true;
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}
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struct account* follower = account_from_uri( act->actor );
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if( !follower ) {
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printf( "Follower account not present local. Active follow not possible. Discarding undo\n" );
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return true;
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}
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printf( "TODO: undo %s following %s\n", act->actor, target );
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return false;
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default:
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printf( "Unhandled object activity type %d in undo\n", act->object.ptr->type );
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return false;
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};
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return false;
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}
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bool route_follow( struct ap_activity* act )
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{
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struct account* follower = NULL;
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bool res = false;
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struct ap_activity* accept = NULL;
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const char* target = act->object.ref;
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struct account* a = account_from_uri( target );
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if( !a || 0 != strcmp( a->server, g_server_name ) ) {
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printf( "Unfollow not targeted at local account. Discarding.\n" );
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goto success;
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}
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follower = account_from_uri( act->actor );
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if( !follower ) {
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follower = account_fetch_from_uri( act->actor );
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}
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if( !follower ) {
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printf( "Unable to fetch account for %s\n", act->actor );
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goto failed;
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}
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// Create Accept activity
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accept = ap_activity_create_accept(act);
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char filename[512]; snprintf( filename, 512, "data/outbox/%d.json", accept->local_id );
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char tmp_filename[512]; snprintf( tmp_filename, 512, "%s.tmp", filename );
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FILE* f = fopen(tmp_filename,"w");
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fprintf( f, "to: %d\n", follower->id );
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ap_activity_write_to_FILE( accept, f );
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fclose(f);
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rename( tmp_filename, filename );
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success:
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res = true;
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cleanup:
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ap_activity_free(accept);
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account_free(a);
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account_free(follower);
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exit(0);
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return res;
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failed:
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res = false;
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goto cleanup;
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}
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bool route_activity( struct ap_activity* act )
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{
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switch( act->type ) {
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case apat_undo: return route_undo_activity(act);
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case apat_follow: return route_follow(act);
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default:
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printf( "Unhandled activity type: %d\n", act->type );
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}
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return false;
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}
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bool process_one()
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{
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// Items requiring cleanup
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struct ap_activity* act = NULL;
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struct ap_envelope* env = NULL;
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bool result = false;
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int tail_pos = fs_list_get("data/inbox/TAIL");
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int head_pos = fs_list_get("data/inbox/HEAD");
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if( head_pos <= tail_pos ) { return false; }
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// We have data to process
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printf( "Inbox has %d items pending processing...\n", (head_pos - tail_pos) );
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int id = tail_pos + 1;
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env = ap_envelope_from_id(id);
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bool step_tail = false;
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if( !env ) {
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printf( "Failed to parse envelope+activity for data/inbox/%d.json\n", id );
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return false;
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}
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// Validate signature
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env->validated = http_signature_validate( env, "post /inbox" );
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// Load activity
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FILE* f = fmemopen( env->body, strlen(env->body), "r" );
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act = ap_activity_from_FILE(f);
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if( !act ) { goto failed; }
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// Discard delete requests
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if( act->type == apat_delete ) {
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step_tail = true;
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goto step;
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}
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if( !env->validated ) { goto failed; }
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printf( "Processing %d\n", id );
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step_tail = route_activity( act );
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finished:
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printf( "handled: %c\n", step_tail ? 'T' : 'F' );
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if( step_tail ) {
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fs_list_set( "data/inbox/TAIL", id );
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result = true;
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}
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ap_activity_free(act);
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ap_envelope_free(env);
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return result;
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failed:
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result = false;
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goto finished;
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step:
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result = true;
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goto finished;
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}
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bool cleanup_inbox()
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{
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int tail_pos = fs_list_get("data/inbox/TAIL");
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int dead_pos = fs_list_get("data/inbox/DEAD");
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if( dead_pos < tail_pos ) {
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char filename[512];
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snprintf( filename, 512, "data/inbox/%d.json", dead_pos + 1 );
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FILE* f = fopen( filename, "r" );
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if( f ) {
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fclose(f);
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if( 0 == remove(filename) ) {
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// File successfully remove, advance
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fs_list_set( "data/inbox/DEAD", dead_pos + 1 );
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return true;
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}
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} else {
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// File already doesn't exist, advance
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fclose(f);
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fs_list_set( "data/inbox/DEAD", dead_pos + 1 );
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return true;
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}
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}
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return false;
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}
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void process_inbox()
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{
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while( !terminate ) {
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bool activity = false;
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activity |= process_one();
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if( !activity ) {
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printf( "TODO: unhandled activity\n" );
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exit(1);
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}
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activity |= cleanup_inbox();
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if( !activity ) {
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fflush(stdout);
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sleep(10);
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}
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}
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}
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