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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 <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sysexits.h>
#include <unistd.h>
#include "archive.h"
#include "imap.h"
bool exportFetch(FILE *imap, enum Atom tag, struct List threads) {
struct List uids = {0};
listFlatten(&uids, threads);
for (size_t i = uids.len - 1; i < uids.len; --i) {
uint32_t uid = dataCheck(uids.ptr[i], Number).number;
int error = 0
|| access(pathUID(uid, "atom"), F_OK)
|| access(pathUID(uid, "html"), F_OK)
|| access(pathUID(uid, "mbox"), F_OK);
if (!error) uids.ptr[i] = uids.ptr[--uids.len];
}
if (!uids.len) {
listFree(uids);
return false;
}
fprintf(imap, "%s UID FETCH ", Atoms[tag]);
for (size_t i = 0; i < uids.len; ++i) {
fprintf(imap, "%s%" PRIu32, (i ? "," : ""), uids.ptr[i].number);
}
fprintf(
imap,
" (UID ENVELOPE BODYSTRUCTURE"
" BODY[HEADER.FIELDS (" MBOX_HEADERS ")] BODY[TEXT])\r\n"
);
return true;
}
static void exportMbox(
uint32_t uid, const struct Envelope *envelope,
const char *header, const char *body
) {
const char *path = pathUID(uid, "mbox");
FILE *file = fopen(path, "w");
if (!file) err(EX_CANTCREAT, "%s", path);
int error = 0
|| mboxFrom(file)
|| mboxHeader(file, header)
|| mboxBody(file, body)
|| fclose(file);
if (error) err(EX_IOERR, "%s", path);
const char *msg = pathMessage(envelope->messageID, "mbox");
unlink(msg);
error = link(path, msg);
if (error) err(EX_CANTCREAT, "%s", msg);
}
static void exportAtom(
uint32_t uid, const struct Envelope *envelope,
const struct BodyPart *structure, const char *body
) {
const char *path = pathUID(uid, "atom");
FILE *file = fopen(path, "w");
if (!file) err(EX_CANTCREAT, "%s", path);
int error = atomEntryOpen(file, envelope);
if (error) err(EX_IOERR, "%s", path);
if (
!structure->multipart &&
!strcmp(structure->type, "TEXT") &&
!strcmp(structure->subtype, "PLAIN")
) {
// TODO: Decode content into file.
error = 0
|| atomContentOpen(file)
|| escapeXML(file, body)
|| atomContentClose(file);
if (error) err(EX_IOERR, "%s", path);
}
error = atomEntryClose(file) || fclose(file);
if (error) err(EX_IOERR, "%s", path);
}
static void exportFetchParts(
FILE *imap, struct List *parts, const struct BodyPart *structure
) {
if (structure->multipart) {
for (size_t i = 0; i < structure->parts.len; ++i) {
struct Data part = { .type = Number, .number = 1 + i };
listPush(parts, part);
exportFetchParts(imap, parts, &structure->parts.ptr[i]);
parts->len--;
}
} else if (
structure->message.structure &&
structure->message.structure->multipart
) {
exportFetchParts(imap, parts, structure->message.structure);
} else {
fprintf(imap, " BODY[");
for (size_t i = 0; i < parts->len; ++i) {
fprintf(imap, "%s%" PRIu32, (i ? "." : ""), parts->ptr[i].number);
}
if (structure->message.structure) {
fprintf(imap, ".TEXT");
}
fprintf(imap, "]");
}
}
bool exportData(FILE *imap, enum Atom tag, struct List items) {
uint32_t uid = 0;
struct Envelope envelope = {0};
struct BodyPart structure = {0};
const char *header = NULL;
const char *text = NULL;
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];
if (name == AtomUID) {
uid = dataCheck(data, Number).number;
} else if (name == AtomEnvelope) {
parseEnvelope(&envelope, dataCheck(data, List).list);
} else if (name == AtomBodyStructure) {
parseBodyPart(&structure, dataCheck(data, List).list);
}
if (name != AtomBody) continue;
struct List section = dataCheck(data, List).list;
if (!section.len) {
errx(EX_PROTOCOL, "missing body data item section");
}
if (i + 2 >= items.len) {
errx(EX_PROTOCOL, "missing body data item value");
}
data = items.ptr[++i + 1];
if (section.ptr[0].type == Atom) {
name = section.ptr[0].atom;
if (name == AtomHeaderFields) {
header = dataCheck(data, String).string;
} else if (name == AtomText) {
text = dataCheck(data, String).string;
}
continue;
}
// TODO: Build a structure of body data parallel to structure.
}
if (!uid) {
errx(EX_PROTOCOL, "missing UID data item");
}
if (!structure.subtype) {
errx(EX_PROTOCOL, "missing BODYSTRUCTURE data item");
}
bool fetch = false;
if (envelope.subject) {
if (!header) {
errx(EX_PROTOCOL, "missing BODY[HEADER.FIELDS] data item");
}
if (!text) {
errx(EX_PROTOCOL, "missing BODY[TEXT] data item");
}
exportMbox(uid, &envelope, header, text);
exportAtom(uid, &envelope, &structure, text);
if (structure.multipart) {
fetch = true;
fprintf(
imap, "%s UID FETCH %" PRIu32 " (UID BODYSTRUCTURE",
Atoms[tag], uid
);
struct List parts = {0};
exportFetchParts(imap, &parts, &structure);
listFree(parts);
fprintf(imap, ")\r\n");
}
} else {
// TODO: Correlate body parts to body data.
}
envelopeFree(envelope);
bodyPartFree(structure);
return fetch;
}
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