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/* Copyright (C) 2020 C. McEnroe <june@causal.agency>
*
* 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/>.
*/
#include <err.h>
#include <inttypes.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sysexits.h>
#include "archive.h"
#include "imap.h"
static uint32_t threadRoot(struct List thread) {
if (!thread.len) errx(EX_PROTOCOL, "empty thread");
while (thread.ptr[0].type == List) {
thread = thread.ptr[0].list;
if (!thread.len) errx(EX_PROTOCOL, "empty subthread");
}
return dataCheck(thread.ptr[0], Number).number;
}
static struct List threadFind(struct List threads, uint32_t root) {
for (size_t i = 0; i < threads.len; ++i) {
struct List thread = dataCheck(threads.ptr[i], List).list;
if (threadRoot(thread) == root) return thread;
}
errx(EX_TEMPFAIL, "no thread with root UID %" PRIu32, root);
}
void concatFetch(FILE *imap, enum Atom tag, struct List threads) {
fprintf(imap, "%s UID FETCH ", Atoms[tag]);
for (size_t i = 0; i < threads.len; ++i) {
uint32_t root = threadRoot(dataCheck(threads.ptr[i], List).list);
fprintf(imap, "%s%" PRIu32, (i ? "," : ""), root);
}
fprintf(imap, " (UID ENVELOPE)\r\n");
}
static time_t uidNewest(struct List uids, const char *type) {
time_t newest = 0;
for (size_t i = 0; i < uids.len; ++i) {
const char *path = pathUID(dataCheck(uids.ptr[i], Number).number, type);
struct stat status;
int error = stat(path, &status);
if (error) err(EX_DATAERR, "%s", path);
if (status.st_mtime > newest) newest = status.st_mtime;
}
return newest;
}
static int concatFile(FILE *dst, const char *path) {
char buf[4096];
FILE *src = fopen(path, "r");
if (!src) err(EX_DATAERR, "%s", path);
for (size_t len; (len = fread(buf, 1, sizeof(buf), src));) {
size_t n = fwrite(buf, len, 1, dst);
if (!n) return -1;
}
fclose(src);
return 0;
}
static int concatHTML(FILE *file, struct List thread) {
int error;
for (size_t i = 0; i < thread.len; ++i) {
if (thread.ptr[i].type == List) {
error = concatHTML(file, thread.ptr[i].list);
} else {
uint32_t uid = dataCheck(thread.ptr[i], Number).number;
error = htmlThreadOpen(file)
|| concatFile(file, pathUID(uid, "html"));
}
if (error) return error;
}
for (size_t i = 0; i < thread.len; ++i) {
if (thread.ptr[i].type == List) continue;
error = htmlThreadClose(file);
if (error) return error;
}
return 0;
}
void concatData(struct List threads, struct List items) {
uint32_t uid = 0;
struct Envelope envelope = {0};
for (size_t i = 0; i + 1 < items.len; i += 2) {
enum Atom name = dataCheck(items.ptr[i], Atom).atom;
struct Data data = items.ptr[i + 1];
switch (name) {
break; case AtomUID:
uid = dataCheck(data, Number).number;
break; case AtomEnvelope:
parseEnvelope(&envelope, dataCheck(data, List).list);
break; default:;
}
}
if (!uid) errx(EX_PROTOCOL, "missing UID data item");
if (!envelope.subject) errx(EX_PROTOCOL, "missing ENVELOPE data item");
struct List thread = threadFind(threads, uid);
struct List flat = {0};
listFlatten(&flat, thread);
int error;
FILE *file;
const char *path;
struct stat status;
path = pathThread(envelope.messageID, "mbox");
error = stat(path, &status);
if (error || status.st_mtime < uidNewest(flat, "mbox")) {
file = fopen(path, "w");
if (!file) err(EX_CANTCREAT, "%s", path);
for (size_t i = 0; i < flat.len; ++i) {
uint32_t uid = dataCheck(flat.ptr[i], Number).number;
error = concatFile(file, pathUID(uid, "mbox"));
if (error) err(EX_IOERR, "%s", path);
}
error = fclose(file);
if (error) err(EX_IOERR, "%s", path);
}
path = pathThread(envelope.messageID, "atom");
error = stat(path, &status);
if (error || status.st_mtime < uidNewest(flat, "atom")) {
FILE *file = fopen(path, "w");
if (!file) err(EX_CANTCREAT, "%s", path);
error = atomFeedOpen(file, &envelope);
if (error) err(EX_IOERR, "%s", path);
for (size_t i = 0; i < flat.len; ++i) {
uint32_t uid = dataCheck(flat.ptr[i], Number).number;
error = concatFile(file, pathUID(uid, "atom"));
if (error) err(EX_IOERR, "%s", path);
}
error = atomFeedClose(file) || fclose(file);
if (error) err(EX_IOERR, "%s", path);
}
path = pathThread(envelope.messageID, "html");
error = stat(path, &status);
if (error || status.st_mtime < uidNewest(flat, "html")) {
FILE *file = fopen(path, "w");
if (!file) err(EX_CANTCREAT, "%s", path);
error = 0
|| htmlThreadHead(file, &envelope) // TODO: Include -h file.
|| htmlThreadHeader(file, &envelope)
|| concatHTML(file, thread)
|| htmlThreadTail(file)
|| fclose(file);
if (error) err(EX_IOERR, "%s", path);
}
listFree(flat);
}
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