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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 <errno.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sysexits.h>
#include <unistd.h>
#include "archive.h"
#include "imap.h"
#define ENV_PASSWORD "BUBGER_IMAP_PASSWORD"
static uint32_t uidRead(const char *path) {
FILE *file = fopen(path, "r");
if (!file) return 0;
uint32_t uid;
int n = fscanf(file, "%" SCNu32, &uid);
if (n < 1) errx(EX_DATAERR, "%s: invalid UID", path);
return uid;
}
static void uidWrite(const char *path, uint32_t uid) {
FILE *file = fopen(path, "w");
if (!file) err(EX_CANTCREAT, "%s", path);
int n = fprintf(file, "%" PRIu32 "\n", uid);
if (n < 0) err(EX_IOERR, "%s", path);
int error = fclose(file);
if (error) err(EX_IOERR, "%s", path);
}
static void createDir(const char *path) {
int error = mkdir(path, 0775);
if (error && errno != EEXIST) err(EX_CANTCREAT, "%s", path);
}
int main(int argc, char *argv[]) {
const char *host = NULL;
const char *port = "imaps";
const char *user = NULL;
const char *passPath = NULL;
const char *mailbox = "Archive";
const char *algo = "REFERENCES";
const char *search = "ALL";
const char *title = NULL;
const char *headPath = NULL;
for (int opt; 0 < (opt = getopt(argc, argv, "C:a:h:p:s:t:vw:"));) {
switch (opt) {
break; case 'C': {
int error = chdir(optarg);
if (error) err(EX_NOINPUT, "%s", optarg);
}
break; case 'a': algo = optarg;
break; case 'h': headPath = optarg;
break; case 'p': port = optarg;
break; case 's': search = optarg;
break; case 't': title = optarg;
break; case 'v': imapVerbose = true;
break; case 'w': passPath = optarg;
}
}
if (optind < argc) host = argv[optind++];
if (optind < argc) user = argv[optind++];
if (optind < argc) mailbox = argv[optind++];
if (!host) errx(EX_USAGE, "host required");
if (!user) errx(EX_USAGE, "user required");
if (!title) title = mailbox;
char *pass = NULL;
if (passPath) {
FILE *file = fopen(passPath, "r");
if (!file) err(EX_NOINPUT, "%s", passPath);
size_t cap = 0;
ssize_t len = getline(&pass, &cap, file);
if (len < 0) err(EX_IOERR, "%s", passPath);
if (len && pass[len - 1] == '\n') pass[len - 1] = '\0';
fclose(file);
} else {
pass = getenv(ENV_PASSWORD);
if (!pass) errx(EX_CONFIG, ENV_PASSWORD " unset");
}
enum Atom login = 0;
enum Atom examine = atom("EXAMINE");
enum Atom thread = atom("THREAD");
enum Atom export = 0;
FILE *imap = imapOpen(host, port);
for (struct Resp resp; resp = imapResp(imap), resp.resp != AtomBye;) {
if (resp.resp == AtomNo || resp.resp == AtomBad) {
errx(EX_CONFIG, "%s %s", Atoms[resp.resp], resp.text);
}
if (!login) {
login = atom("login");
fprintf(
imap, "%s LOGIN \"%s\" \"%s\"\r\n",
Atoms[login], user, pass
);
}
if (resp.tag == login) {
fprintf(imap, "%s EXAMINE \"%s\"\r\n", Atoms[examine], mailbox);
}
if (
resp.resp == AtomOk &&
resp.code.len > 1 &&
resp.code.ptr[0].type == Atom
) {
enum Atom code = resp.code.ptr[0].atom;
if (code == AtomUIDValidity || code == AtomUIDNext) {
if (resp.code.ptr[1].type != Number) {
errx(EX_PROTOCOL, "invalid %s", Atoms[code]);
}
}
if (code == AtomUIDValidity) {
uint32_t validity = resp.code.ptr[1].number;
uint32_t previous = uidRead("UIDVALIDITY");
if (previous && validity != previous) {
errx(
EX_TEMPFAIL,
"UIDVALIDITY changed; fresh export required"
);
}
if (!previous) uidWrite("UIDVALIDITY", validity);
}
if (code == AtomUIDNext) {
uint32_t next = resp.code.ptr[1].number;
uint32_t prev = uidRead("UIDNEXT");
if (next == prev) {
examine = 0;
fprintf(imap, "ayy LOGOUT\r\n");
} else {
uidWrite("UIDNEXT", next);
}
}
}
if (resp.tag == examine) {
fprintf(
imap, "%s UID THREAD %s UTF-8 %s\r\n",
Atoms[thread], algo, search
);
}
if (resp.resp == thread) {
if (!resp.data.len) {
errx(EX_TEMPFAIL, "no messages matching %s", search);
}
createDir("UID");
createDir("message");
export = exportThreads(imap, resp.data);
}
if (export && resp.resp == AtomFetch) {
if (!resp.data.len || resp.data.ptr[0].type != List) {
errx(EX_PROTOCOL, "invalid FETCH data");
}
exportData(resp.data.ptr[0].list);
}
respFree(resp);
}
fclose(imap);
}
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