Add dillo-zet

5 years ago · 5561c79321
parent 9e301ef3b3
commit 5561c79321
9 changed files with 1904 additions and 0 deletions
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 zet.dpi
 *.o
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--- a/35
+++ b/35
@ -0,0 +1,35 @@
 NAME=zet
 BIN=zet.dpi
 DILLO_DIR=~/.dillo
 DPI_DIR=$(DILLO_DIR)/dpi
 SUNDOWN_SRC=$(wildcard sundown/*.c)
 OBJ=dpi.o zet.dpi.o io.o $(SUNDOWN_SRC:c=o)
 CFLAGS=-Wall -Wextra -pedantic
 all-reload: all
 	pkill $(BIN)
 all: $(BIN)
 $(BIN): $(OBJ)
 install: $(BIN) domainrc
 	mkdir -p $(DPI_DIR)/$(NAME)
 	cp -f $(BIN) $(DPI_DIR)/$(NAME)
 link: $(BIN) domainrc
 	mkdir -p $(DPI_DIR)/$(NAME)
 	ln -frs $(BIN) $(DPI_DIR)/$(NAME)
 domainrc: $(DILLO_DIR)/domainrc
 	@grep -q '^default accept$$' $< || \
 		echo 'Note: Set "default accept" in $< to enable redirects'
 $(DILLO_DIR)/domainrc:
 	echo 'default accept' > $@
 clean:
 	rm $(BIN) $(OBJ)
 uninstall: $(BIN)
 	rm -f $(DPI_DIR)/$(NAME)/$(BIN)
--- a/README.md
+++ b/README.md
@ -0,0 +1,51 @@
 # dillo-zet
 Zettelkasten application for [Dillo][].
 ## Install from [git-ssb][]
 ```
 git clone ssb://%R1c3tDmS57iZ5G+g4UkLSWQehG/WUVLd1Y9XkTlng8Y=.sha256 dillo-zet
 cd dillo-zet
 make install
 dpid stop
 ```
 You can also use `make link` instead of `make install`, to install via a symlink.
 Then visit <dpi:/zet/> in Dillo.
 ## Usage
 - <dpi:/zet/> - Main page (list all notes)
 - <dpi:/zet/ID> - View a note
 - <dpi:/zet/new> - Draft a new note
 Notes are identified by a string of hexadecimal characters, prefixed by a section sign ("§"). The section sign is not included in the `dpi:/zet/` URL.
 The note format is Markdown as parsed by the [sundown][] library, with some changes, e.g. to linkify dillo-zet ids, and to make it a little more like SSB markdown.
 Notes are stored as plain text files in a `~/.zet` directory.
 ## Screenshot
 ![dillo-zet-screenshot-invidious.png](&oLj9GQS8Acb1OJkzjBB/0GySl8/ZycZ0WGc9ptDFxFg=.sha256)
 [Dillo]: https://www.dillo.org/
 [git-ssb]: %n92DiQh7ietE+R+X/I403LQoyf2DtR3WQfCkDKlheQU=.sha256
 [sundown]: https://github.com/vmg/sundown
 ## License
 Copyright 2020 Charles E. Lehner
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU Affero 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 Affero General Public License for more details.
 You should have received a copy of the GNU Affero General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
--- a/dpi.c
+++ b/dpi.c
@ -0,0 +1,75 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>
 #include <err.h>
 #include "dpi.h"
 #include "io.h"
 int dpi_check_auth(int fd) {
 	char buf[30];
 	char key[4], local_key[4];
 	char keys[128];
 	char *home;
 	ssize_t sz;
 	int rc;
 	rc = read_all(fd, buf, 28);
 	if (rc < 0) return -1;
 	buf[29] = '\0';
 	// first byte was read already
 	rc = sscanf(buf, "cmd='auth' msg='%4x' '>", key);
 	if (rc < 1) { errno = EPROTO; return -1; }
 	home = getenv("HOME");
 	if (!home) home = ".";
 	sz = read_file(keys, sizeof(keys), "%s/.dillo/dpid_comm_keys", home);
 	if (sz < 0) { errno = ENOKEY; return -1; }
 	rc = sscanf(keys, "%*d %4x", local_key);
 	if (rc < 1) { errno = ENOKEY; return -1; }
 	if (memcmp(key, local_key, 4)) { errno = EKEYREJECTED; return -1; }
 	return 0;
 }
 int dpi_read_request(int fd, char *url_buf, size_t url_len) {
 	char buf[21];
 	size_t len;
 	int rc;
 	int i;
 	rc = read_all(fd, buf, sizeof(buf));
 	if (rc < 0 && errno == EPIPE && !strncmp(buf, "<cmd='DpiBye' '>", 16)) {
 		errno = ESHUTDOWN;
 		return -1;
 	}
 	if (rc < 0) return -1;
 	if (strncmp(buf, "<cmd='open_url' url='", 21)) {
 		errno = EPROTO;
 		return -1;
 	}
 	len = url_len;
 	rc = read_some(fd, url_buf, &len);
 	if (rc < 0) return -1;
 	for (i = 0; i < len-1; i++) {
 		if (url_buf[i] == '\'' && url_buf[i+1] == ' ') break;
 	}
 	if (i > len-3 || strncmp(url_buf + i, "' '>", 4)) {
 		errno = EPROTO;
 		return -1;
 	}
 	url_buf[i] = '\0';
 	return 0;
 }
 int dpi_send_status(int fd, const char *status) {
 	return dprintf(fd, "<cmd='send_status_message' msg='%s' '>", status);
 }
 int dpi_send_header(int fd, const char *content_type) {
 	return dprintf(fd, "<cmd='start_send_page' url='' '>"
 	              "Content-Type: %s\n\n", content_type);
 }
 int dpi_reload(int fd) {
 	return dprintf(fd, "<cmd='reload_request' url='' '>");
 }
--- a/dpi.h
+++ b/dpi.h
@ -0,0 +1,9 @@
 #pragma once
 #include <stddef.h>
 int dpi_check_auth(int fd);
 int dpi_read_request(int fd, char *url_buf, size_t url_len);
 int dpi_send_status(int fd, const char *status);
 int dpi_send_header(int fd, const char *content_type);
 int dpi_reload(int fd);
--- a/io.c
+++ b/io.c
@ -0,0 +1,112 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <netdb.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/stat.h>
 #include <unistd.h>
 #include "io.h"
 int read_all(int fd, unsigned char *buf, size_t len) {
 	ssize_t nbytes;
 	while (len > 0) {
 		nbytes = read(fd, buf, len);
 		if (nbytes == 0) { errno = EPIPE; return -1; }
 		if (nbytes < 0 && errno == EINTR) continue;
 		if (nbytes < 0) return -1;
 		buf += nbytes;
 		len -= nbytes;
 	}
 	return 0;
 }
 int read_some(int fd, unsigned char *buf, size_t *lenp) {
 	ssize_t nbytes;
 	do nbytes = read(fd, buf, *lenp);
 	while (nbytes < 0 && errno == EINTR);
 	if (nbytes == 0) { errno = EPIPE; return -1; }
 	if (nbytes < 0) return -1;
 	*lenp = nbytes;
 	return 0;
 }
 int read_char(int fd) {
 	ssize_t nbytes;
 	char buf[1];
 	do nbytes = read(fd, buf, 1);
 	while (nbytes < 0 && errno == EINTR);
 	if (nbytes < 0) return -1;
 	if (nbytes == 0) { errno = EPIPE; return -1; }
 	return buf[0];
 }
 int write_all(int fd, const unsigned char *buf, size_t count) {
 	ssize_t nbytes;
 	while (count > 0) {
 		nbytes = write(fd, buf, count);
 		if (nbytes < 0 && errno == EINTR) continue;
 		if (nbytes < 0) return -1;
 		buf += nbytes;
 		count -= nbytes;
 	}
 	return 0;
 }
 int write_char(int fd, char c) {
 	ssize_t nbytes;
 	char buf[1] = {c};
 	do nbytes = write(fd, buf, 1);
 	while (nbytes < 0 && errno == EINTR);
 	if (nbytes < 0) return -1;
 	if (nbytes == 0) { errno = EPIPE; return -1; }
 	return 0;
 }
 ssize_t read_file(char *buf, size_t len, const char *fmt, ...) {
 	va_list ap;
 	int rc;
 	struct stat st;
 	int fd;
 	va_start(ap, fmt);
 	rc = vsnprintf(buf, len, fmt, ap);
 	va_end(ap);
 	if (rc < 0) return -1;
 	if ((size_t)rc >= len) { errno = ENAMETOOLONG; return -1; }
 	rc = stat(buf, &st);
 	if (rc < 0) return -1;
 	if ((size_t)st.st_size > len-1) { errno = EMSGSIZE; return -1; }
 	fd = open(buf, O_RDONLY);
 	if (fd < 0) return -1;
 	rc = read_all(fd, (unsigned char *)buf, st.st_size);
 	if (rc < 0) return -1;
 	buf[(size_t)st.st_size] = '\0';
 	close(fd);
 	return st.st_size;
 }
 char *read_full(int fd) {
 	int rc;
 	struct stat st;
 	rc = fstat(fd, &st);
 	if (rc < 0) return NULL;
 	char *buf = malloc(st.st_size + 1);
 	if (buf == NULL) return NULL;
 	rc = read_all(fd, (unsigned char *)buf, st.st_size);
 	if (rc < 0) return NULL;
 	buf[(size_t)st.st_size] = '\0';
 	close(fd);
 	return buf;
 }
--- a/io.h
+++ b/io.h
@ -0,0 +1,14 @@
 #pragma once
 #include <stddef.h>
 #define write_buf(fd, buf) \
 	write_all(fd, (unsigned const char *)buf, sizeof(buf)-1)
 int read_all(int fd, unsigned char *buf, size_t count);
 int read_some(int fd, unsigned char *buf, size_t *lenp);
 int read_char(int fd);
 ssize_t read_file(char *buf, size_t len, const char *fmt, ...);
 int write_all(int fd, unsigned const char *buf, size_t count);
 int write_char(int fd, char c);
 char *read_full(int fd);
--- a/zet.dpi.c
+++ b/zet.dpi.c
@ -0,0 +1,945 @@
 #include <arpa/inet.h>
 #include <err.h>
 #include <errno.h>
 #include <dirent.h>
 #include <fcntl.h>
 #include <limits.h>
 #include <stdarg.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <time.h>
 #include <unistd.h>
 #include "dpi.h"
 #include "io.h"
 #include "sundown/markdown.h"
 #include "sundown/html.h"
 #include "sundown/buffer.h"
 #include "sundown/houdini.h"
 #define NAV_ALL "<a href=\".\">All</a>"
 #define NAV_NEW "<a href=\"new\">New</a>"
 #define STRONG(html) "<strong>" html "</strong>"
 #define TOPBAR_NAV NAV_ALL " " NAV_NEW " "
 #define TOPBAR_NAV_ALL STRONG(NAV_ALL) " " NAV_NEW " "
 #define TOPBAR_NAV_NEW NAV_ALL " " STRONG(NAV_NEW) " "
 static const size_t sigil_size = sizeof("§")-1;
 static const int id_length = 16;
 static const int max_cols = 40;
 static char server_hostname[256];
 static char server_url[256];
 static char zet_dir[_POSIX_PATH_MAX-64];
 struct http_request {
 	char *method;
 	char *path;
 	char *query;
 	char *hash;
 	char *http_version;
 	char *host;
 	char *referer;
 	ssize_t content_length;
 	char *content_type;
 	char *multipart_boundary;
 	int fd;
 	char *data, *full_data;
 	size_t len;
 };
 struct zet_search {
 	DIR *dir;
 	char *id;
 };
 static int count_lines_in(const char *str) {
 	int count = 0;
 	char c;
 	int col = 0;
 	while ((c = *str++)) {
 		if (c == '\n' || col++ > max_cols) {
 			count++;
 			col = 0;
 		}
 	}
 	return count;
 }
 static int count_lines(int fd) {
 	int count = 0;
 	do {
 		unsigned char buf[4096];
 		size_t len = sizeof(buf)-1;
 		int rc = read_some(fd, buf, &len);
 		if (rc < 0) {
 			if (errno == EPIPE) break;
 			return -1;
 		}
 		buf[len] = '\0';
 		count += count_lines_in((char *)buf);
 	} while (1);
 	return count;
 }
 static int write_html_char(int fd, char c) {
 	switch (c) {
 		case '&': return write_buf(fd, "&amp;");
 		case '<': return write_buf(fd, "&lt;");
 		case '>': return write_buf(fd, "&gt;");
 		case '"': return write_buf(fd, "&quot;");
 	}
 	return write_char(fd, c);
 }
 static int write_html(int fd, const char *buf, size_t len) {
 	while (len > 0) {
 		// note: buf must null-terminated
 		char *next = strpbrk(buf, "&<>\"");
 		if (next == NULL) return write_all(fd, (unsigned char *)buf, len);
 		char c = *next;
 		size_t sublen = next - buf;
 		int rc = write_all(fd, (unsigned char *)buf, sublen);
 		if (rc < 0) return -1;
 		buf += sublen + 1;
 		len -= sublen + 1;
 		rc = write_html_char(fd, c);
 		if (rc < 0) return -1;
 	}
 	return 0;
 }
 static int passthrough_note_html(int fd, int note_fd) {
 	int rc;
 	do {
 		unsigned char buf[4096];
 		size_t len = sizeof(buf)-1;
 		rc = read_some(note_fd, buf, &len);
 		if (rc < 0) {
 			if (errno != EPIPE) dprintf(fd,
 				"\n<strong>Error</strong>: %s", strerror(errno));
 			break;
 		}
 		buf[len] = '\0';
 		rc = write_html(fd, (char *)buf, len);
 		if (rc < 0) warn("write_html");
 	} while (rc == 0);
 	return 0;
 }
 static int dpi_respond_err(int fd, const char *fmt, ...) {
 	int rc;
 	va_list ap;
 	int err = errno;
 	va_start(ap, fmt);
 	rc = dpi_send_header(fd, "text/plain");
 	rc |= vdprintf(fd, fmt, ap);
 	rc |= dprintf(fd, ": %s", strerror(err));
 	va_end(ap);
 	rc |= close(fd);
 	return rc;
 }
 static char *zet_get_title(const char *id, char *buf, size_t len) {
 	char path_buf[_POSIX_PATH_MAX];
 	ssize_t sz = snprintf(path_buf, sizeof(path_buf), "%s/%s", zet_dir, id);
 	if (sz < 0 || (size_t)sz >= sizeof(path_buf)) return NULL;
 	int fd = open(path_buf, O_RDONLY);
 	if (fd < 0) return NULL;
 	int rc = read_some(fd, (unsigned char *)buf, &len);
 	if (rc < 0) { close(fd); return NULL; }
 	buf[len] = '\0';
 	char *end = strchr(buf, '\n');
 	if (end != NULL) *end = '\0';
 	close(fd);
 	while (*buf == '#') buf++;
 	while (*buf == ' ') buf++;
 	return buf;
 }
 static char *zet_get_buf_title(const struct buf *link, char *buf, size_t len) {
 	char id_buf[128];
 	strncpy(id_buf, link->data, link->size);
 	id_buf[sizeof(id_buf)-1] = '\0';
 	return zet_get_title(id_buf + sigil_size, buf, len);
 }
 static int zet_links_in(const char *str, const char *id_to) {
 	while (1) {
 		str = strstr(str, "§");
 		if (str == NULL) return 0;
 		str += sigil_size;
 		if (!strncmp(str, id_to, id_length)) return 1;
 	}
 	return 0;
 }
 static int zet_links_to(const char *id_from, const char *id_to) {
 	// TODO: index links, so that every source file doesn't have to be read all
 	// the time
 	int rc;
 	char path_buf[_POSIX_PATH_MAX];
 	ssize_t sz = snprintf(path_buf, sizeof(path_buf), "%s/%s", zet_dir, id_from);
 	if (sz < 0 || (size_t)sz >= sizeof(path_buf)) return -1;
 	int fd = open(path_buf, O_RDONLY);
 	if (fd < 0) return -1;
 	size_t fringe = 0;
 	size_t link_len = strlen(id_to) + id_length;
 	unsigned char buf[4096];
 	do {
 		size_t len = sizeof(buf)-fringe-1;
 		rc = read_some(fd, buf + fringe, &len);
 		if (rc < 0) {
 			if (errno != EPIPE) { close(fd); return -1; }
 			close(fd);
 			return 0;
 		}
 		buf[len - fringe] = '\0';
 		rc = zet_links_in((char *)buf, id_to);
 		if (rc < 0) { close(fd); return -1; }
 		// in case a link is across the boundary between this buf and the next,
 		// keep some "fringe" of the end of this buf in the beginning of the
 		// next one
 		if (len > link_len) {
 			fringe = link_len;
 			memcpy(buf, buf + len - fringe, fringe);
 		}
 	} while (rc == 0);
 	close(fd);
 	return rc;
 }
 static int zet_search_start(struct zet_search *zs, char *id) {
 	zs->dir = opendir(zet_dir);
 	if (zs->dir == NULL) return -1;
 	zs->id = id;
 	return 0;
 }
 static int zet_search_next(struct zet_search *zs, const char **idp) {
 	int rc;
 	struct dirent *ent;
 	const char *id;
 	char *const dest_id = zs->id;
 	while (1) {
 		errno = 0;
 		ent = readdir(zs->dir);
 		if (ent == NULL) {
 			if (errno != 0) return -1;
 			id = NULL;
 			break;
 		}
 		id = ent->d_name;
 		if (id[0] == '.') continue;
 		if (strpbrk(id, "<>&\"~") != NULL) continue;
 		if (dest_id != NULL) {
 			rc = zet_links_to(id, zs->id);
 			if (rc < 0) return -1;
 			if (rc != 1) continue;
 		}
 		break;
 	};
 	*idp = id;
 	return 0;
 }
 static int zet_search_close(struct zet_search *sz) {
 	return closedir(sz->dir);
 }
 static int dpi_serve_zet_index(int fd) {
 	int rc;
 	struct zet_search zs;
 	rc = zet_search_start(&zs, NULL);
 	if (rc < 0) return dpi_respond_err(fd, "Unable to list");
 	rc = dpi_send_header(fd, "text/html");
 	if (rc < 0) { warn("dpi_send_header"); close(fd); return 0; }
 	rc = dprintf(fd,
 			"<!doctype html><html><head>"
 			"<title>Notes</title>"
 			"<meta charset=utf-8>"
 			"</head>"
 			"<body>"
 			"<div>" TOPBAR_NAV_ALL "</div>"
 			"<ul>"
 			);
 	const char *id;
 	while (1) {
 		rc = zet_search_next(&zs, &id);
 		if (rc < 0) {
 			rc = dprintf(fd,
 				"\n<strong>Error</strong>: %s\n",
 				strerror(errno));
 			if (rc < 0) warnx("dprintf");
 			close(fd);
 			return 0;
 		}
 		if (id == NULL) break;
 		char title_buf[128];
 		char *title = zet_get_title(id, title_buf, sizeof(title_buf));
 		if (title == NULL) {
 			warn("zet_get_title");
 			title = title_buf;
 			strncpy(title, id, sizeof(title)-1);
 			title[sizeof(title)-1] = '\0';
 			return 0;
 		}
 		rc = dprintf(fd, "<li><a href=\"%s\">", id);
 		rc |= write_html(fd, title, strlen(title));
 		rc |= write_buf(fd, "</a></li>");
 		if (rc < 0) { warnx("dprintf/write_html/write_buf"); close(fd); return 0; }
 	}
 	rc = dprintf(fd, "</ul></body></html>");
 	if (rc < 0) { warn("dprintf"); close(fd); return 0; }
 	rc = zet_search_close(&zs);
 	if (rc < 0) warn("closedir");
 	close(fd);
 	return 0;
 }
 static int dpi_serve_not_found(int fd) {
 	int rc = dpi_send_header(fd, "text/html");
 	if (rc < 0) { warn("dpi_send_header"); close(fd); return 0; }
 	write_buf(fd, "Not Found");
 	close(fd);
 	return 0;
 }
 static int dpi_serve_zet_new(int fd) {
 	int rc = dpi_send_header(fd, "text/html");
 	if (rc < 0) { warn("dpi_send_header"); close(fd); return 0; }
 	dprintf(fd,
 		"<!doctype html><html><head>"
 		"<title>New Note</title>"
 		"<meta charset=utf-8>"
 		"</head>"
 		"<body>"
 		"<div>" TOPBAR_NAV_NEW "</div>"
 		"<form method=post action=\"%snew\" enctype=\"multipart/form-data\">"
 		"<textarea name=text cols=64 style=\"width:50%%;height:80%%\"></textarea><br>"
 		"<input type=submit value=\"Save\">"
 		"</form></html>"
 		, server_url);
 	close(fd);
 	return 0;
 }
 static void parse_req_uri(char *path, char **hashp, char **queryp) {
 	char *hash = *hashp = strchr(path, '#');
 	if (hash != NULL) *hash++ = '\0';
 	char *query = *queryp = strchr(path, '?');
 	if (query != NULL) *query++ = '\0';
 }
 static int
 md_rndr_link(struct buf *ob, const struct buf *link, const struct buf *title, const struct buf *content, void *opaque)
 {
 	struct html_renderopt *options = opaque;
 	if (link != NULL && (options->flags & HTML_SAFELINK) != 0 && !sd_autolink_issafe(link->data, link->size))
 		return 0;
 	BUFPUTSL(ob, "<a href=\"");
 	if (link && link->size > sigil_size) {
 		if (!strncmp((char *)link->data, "§", sigil_size))
 			houdini_escape_href(ob, link->data + sigil_size,
 					link->size - sigil_size);
 		else
 			houdini_escape_href(ob, link->data, link->size);
 	}
 	if (title && title->size) {
 		BUFPUTSL(ob, "\" title=\"");
 		houdini_escape_html0(ob, title->data, title->size, 0);
 	}
 	if (options->link_attributes) {
 		bufputc(ob, '\"');
 		options->link_attributes(ob, link, opaque);
 		bufputc(ob, '>');
 	} else {
 		BUFPUTSL(ob, "\">");
 	}
 	if (content && content->size) bufput(ob, content->data, content->size);
 	BUFPUTSL(ob, "</a>");
 	return 1;
 }
 static void put_link_truncated(struct buf *ob, const struct buf *link) {
 	if (link->size < max_cols) {
 		return houdini_escape_html0(ob, link->data, link->size, 0);
 	}
 	houdini_escape_html0(ob, link->data, max_cols, 0);
 	BUFPUTSL(ob, "…");
 }
 static int
 md_rndr_autolink(struct buf *ob, const struct buf *link, enum mkd_autolink type, void *opaque)
 {
 	struct html_renderopt *options = opaque;
 	if (!link || !link->size)
 		return 0;
 	if ((options->flags & HTML_SAFELINK) != 0 &&
 		!sd_autolink_issafe(link->data, link->size) &&
 		type != MKDA_EMAIL)
 		return 0;
 	BUFPUTSL(ob, "<a href=\"");
 	if (type == MKDA_EMAIL)
 		BUFPUTSL(ob, "mailto:");
 	if (type == MKDA_ZET)
 		houdini_escape_href(ob, link->data + sigil_size, link->size - sigil_size);
 	else
 		houdini_escape_href(ob, link->data, link->size);
 	if (type == MKDA_ZET) {
 		char title_buf[128];
 		char *title = zet_get_buf_title(link, title_buf, sizeof(title_buf));
 		if (title != NULL) {
 			BUFPUTSL(ob, "\" title=\"");
 			houdini_escape_html0(ob, title, strlen(title), 0);
 		}
 	}
 	if (options->link_attributes) {
 		bufputc(ob, '\"');
 		options->link_attributes(ob, link, opaque);
 		bufputc(ob, '>');
 	} else {
 		BUFPUTSL(ob, "\">");
 	}
 	/*
 	 * Pretty printing: if we get an email address as
 	 * an actual URI, e.g. `mailto:foo@bar.com`, we don't
 	 * want to print the `mailto:` prefix
 	 */
 	if (bufprefix(link, "mailto:") == 0) {
 		houdini_escape_html0(ob, link->data + 7, link->size - 7, 0);
 	} else {
 		put_link_truncated(ob, link);
 	}
 	BUFPUTSL(ob, "</a>");
 	return 1;
 }
 static int dpi_serve_zet(int fd, char *path) {
 	int rc;
 	char *hash, *query;
 	parse_req_uri(path, &hash, &query);
 	if (!strcmp(path, "/")) return dpi_serve_zet_index(fd);
 	if (!strcmp(path, "/new")) return dpi_serve_zet_new(fd);
 	char path_buf[_POSIX_PATH_MAX];
 	char *id = path+1;
 	ssize_t sz = snprintf(path_buf, sizeof(path_buf), "%s/%s", zet_dir, id);
 	if (sz < 0 || (size_t)sz >= sizeof(path_buf)) return dpi_respond_err(fd, "read_file");
 	int note_fd = open(path_buf, O_RDONLY);
 	if (note_fd < 0 && errno == ENOENT) return dpi_serve_not_found(fd);
 	if (note_fd < 0) return dpi_respond_err(fd, "open");
 	int rows = count_lines(note_fd);
 	if (rows < 0) return dpi_respond_err(fd, "count_lines"); 
 	static const int max_rows = 57, min_rows = 8;
 	if (rows > max_rows) rows = max_rows;
 	else if (rows < min_rows) rows = min_rows;
 	rc = lseek(note_fd, 0, SEEK_SET);
 	if (rc < 0) return dpi_respond_err(fd, "lseek");
 	rc = dpi_send_header(fd, "text/html");
 	rc |= dprintf(fd,
 		"<!doctype html><head>"
 		"<title>§%s</title>"
 		"<meta charset=utf-8>"
 		"</head><body>"
 		"<div>" TOPBAR_NAV " <strong><code><a href=\"%s\">§%s</a></code></strong></div>"
 		"<table style=\"width:100%%; height:100%%\"><tr>"
 		"<td style=\"width:50%%\"><form method=post action=\"%s%s\" enctype=\"multipart/form-data\" style=\"height:100%%\">"
 		"<textarea name=text cols=64 rows=%d style=\"width:100%%\">"
 		, id, id, id, server_url, id, rows);
 	rc = passthrough_note_html(fd, note_fd);
 	if (rc < 0) { warnx("passthrough_note_html"); close(fd); return 0; }
 	rc = dprintf(fd, "</textarea><br>"
 		"<input type=submit value=\"Save\">"
 		"</form></td>"
 		"<style>pre { white-space: pre-wrap; }</style>"
 		"<td>"
 		);
 	if (rc < 0) { warn("dpi_send_header"); close(fd); return 0; }
 	rc = lseek(note_fd, 0, SEEK_SET);
 	if (rc < 0) {
 		rc = dprintf(fd, "\n<strong>Error</strong>: %s", strerror(errno));
 		if (rc < 0) warnx("dprintf");
 		close(fd);
 	}
 	char *text = read_full(note_fd);
 	if (text == NULL) {
 		rc = dprintf(fd, "\n<strong>Error</strong>: %s", strerror(errno));
 		if (rc < 0) warnx("dprintf");
 		close(fd);
 	}
 	struct sd_callbacks callbacks;
 	struct html_renderopt options;
 	struct sd_markdown *markdown;
 	struct buf *ob = bufnew(128);
 	sdhtml_renderer(&callbacks, &options, HTML_ESCAPE);
 	callbacks.link = md_rndr_link;
 	callbacks.autolink = md_rndr_autolink;
 	static const unsigned int extensions =
 		MKDEXT_NO_INTRA_EMPHASIS |
 		MKDEXT_TABLES |
 		MKDEXT_FENCED_CODE |
 		MKDEXT_AUTOLINK |
 		MKDEXT_STRIKETHROUGH |
 		MKDEXT_SPACE_HEADERS |
 		MKDEXT_LAX_SPACING;
 	markdown = sd_markdown_new(extensions, 16, &callbacks, &options);
 	sd_markdown_render(ob, (unsigned char *)text, strlen(text), markdown);
 	free(text);
 	sd_markdown_free(markdown);
 	rc = write_all(fd, ob->data, ob->size);
 	if (rc < 0) warn("write_all");
 	bufrelease(ob);
 	rc = dprintf(fd, "</td></tr>");
 	if (rc < 0) warn("dprintf");
 	rc = dprintf(fd, "<tr><td></td><td>");
 	if (rc < 0) warn("dprintf");
 	struct zet_search zs;
 	bool first = true;
 	rc = zet_search_start(&zs, id);
 	if (rc < 0) warn("zet_search_start");
 	do {
 		const char *result_id;
 		rc = zet_search_next(&zs, &result_id);
 		if (rc < 0) warn("zet_search_next");
 		if (result_id == NULL) break;
 		if (first) {
 			first = false;
 			rc = dprintf(fd, "Backlinks:<ul>");
 			if (rc < 0) warn("dprintf");
 		}
 		char title_buf[128];
 		char *result_title = zet_get_title(result_id, title_buf, sizeof(title_buf));
 		if (result_title == NULL) {
 			warn("zet_get_title");
 			result_title = title_buf;
 			strncpy(result_title, result_id, sizeof(result_title)-1);
 			result_title[sizeof(result_title)-1] = '\0';
 			return 0;
 		}
 		rc = dprintf(fd, "<li><a href=\"%s\">", result_id);
 		rc |= write_html(fd, result_title, strlen(result_title));
 		rc |= write_buf(fd, "</a></li>");
 	} while (1);
 	if (!first) (void)dprintf(fd, "</ul>");
 	rc = dprintf(fd, "</td></tr>");
 	if (rc < 0) warn("dprintf");
 	(void)zet_search_close(&zs);
 	rc = dprintf(fd, "</table></body></html>");
 	if (rc < 0) warn("dprintf");
 	close(fd);
 	return 0;
 }
 static int handle_dpi_client(int fd) {
 	int rc;
 	char url[2048];
 	rc = dpi_check_auth(fd);
 	if (rc < 0) {
 		warn("dpi auth");
 		close(fd);
 		return 0;
 	}
 	rc = dpi_read_request(fd, url, sizeof(url));
 	if (rc < 0) {
 		if (errno == ESHUTDOWN) return -1;
 		warn("dpi request");
 		dpi_respond_err(fd, "Unable to read request");
 		return 0;
 	}
 	if (!strncmp(url, "dpi:/zet/", 9)) {
 		return dpi_serve_zet(fd, url + 8);
 	}
 	return dpi_serve_not_found(fd);
 }
 static char *next_line(char *str) {
 	char *nextline = strchr(str, '\n');
 	if (nextline != NULL) {
 		if (nextline[-1] == '\r') nextline[-1] = '\0';
 		else *nextline = '\0';
 		nextline++;
 	}
 	return nextline;
 }
 static int http_serve_index(struct http_request *req) {
 	write_buf(req->fd, "HTTP/1.0 200 OK\r\nConnection: close\r\n\r\n");
 	close(req->fd);
 	return 0;
 }
 static int save_part(struct http_request *req, int note_fd) {
 	int rc = write_all(note_fd, (unsigned char *)req->data, req->len);
 	rc |= close(note_fd);
 	free(req->full_data);
 	return rc;
 }
 static int parse_multipart(struct http_request *req) {
 	size_t boundary_len = req->multipart_boundary != NULL
 		? strlen(req->multipart_boundary) : 0;
 	if (boundary_len == 0) return -1;
 	ssize_t len = req->content_length;
 	if (len < 0) return -1;
 	if (req->len < (size_t)len) {
 		req->full_data = malloc(len+1);
 		memcpy(req->full_data, req->data, req->len);
 		char *rest = req->full_data + req->len;
 		int rc = read_all(req->fd, (unsigned char *)rest, len - req->len);
 		if (rc < 0) return -1;
 		req->data = req->full_data;
 		req->len = len;
 	}
 	req->data[req->len] = '\0';
 	char *boundary_start = NULL;
 	while (req->len > 0) {
 		boundary_start = strstr(req->data, req->multipart_boundary);
 		if (boundary_start == NULL) return -1;
 		boundary_start += boundary_len;
 		char *line = boundary_start;
 		char *cdisp = NULL;
 		bool is_text = false;
 		if (*line == '\r') line++;
 		if (*line == '\n') line++;
 		char *nextline;
 		while (line != NULL) {
 			nextline = next_line(line);
 			if (!line[0]) break;
 			char *name = line;
 			char *value = strchr(line, ':');
 			if (value != NULL) {
 				*value++ = '\0';
 				while (*value == ' ') value++;
 			}
 			if (!strncmp(name, "Content-Disposition", 3)) cdisp = value;
 			line = nextline;
 		}
 		if (cdisp != NULL && !strcmp(cdisp, "form-data; name=\"text\"")) {
 			is_text = true;
 		}
 		req->len -= nextline - req->data;
 		req->data = nextline;
 		char *end = strstr(nextline, req->multipart_boundary);
 		if (end == NULL || strncmp(end + boundary_len, "--", 2)) return -1;
 		if (end[-1] == '\n') end--;
 		if (end[-1] == '\r') end--;
 		*end = '\0';
 		req->len = end - nextline;
 		if (is_text) break;
 	}
 	return 0;
 }
 static int http_serve_new(struct http_request *req) {
 	int rc;
 	char note_path[_POSIX_PATH_MAX];
 	char id[64];
 	rc = parse_multipart(req);
 	if (rc < 0) {
 		write_buf(req->fd, "HTTP/1.0 400 Bad Request\r\n"
 			"Content-Type: text/plain\r\n"
 			"Connection: close\r\n\r\n"
 			"Unable to parse form submission");
 		close(req->fd);
 		return 0;
 	}
 	(void)mkdir(zet_dir, 0700);
 	srandom(time(NULL) ^ getpid());
 	(void)snprintf(id, sizeof(id), "%08lx%08lx", random(), random());
 	(void)snprintf(note_path, sizeof(note_path), "%s/%s", zet_dir, id);
 	int note_fd = open(note_path, O_CREAT|O_WRONLY|O_TRUNC, 0640);
 	if (note_fd < 0) {
 		dprintf(req->fd, "HTTP/1.0 500 Internal Server Error\r\n"
 			"Content-Type: text/plain\r\n"
 			"Connection: close\r\n\r\n"
 			"Unable to open file: %s\n", strerror(errno));
 		close(req->fd);
 		return 0;
 	}
 	rc = save_part(req, note_fd);
 	if (rc < 0) {
 		dprintf(req->fd, "HTTP/1.0 200 OK\r\n"
 			"Content-Type: text/plain\r\n"
 			"Connection: close\r\n\r\n"
 			"Error saving: %s", strerror(errno));
 		close(req->fd);
 		return 0;
 	}
 	dprintf(req->fd, "HTTP/1.0 302 Found\r\n"
 		"Content-Type: text/html\r\n"
 		"Location: dpi:/zet/%s\r\n"
 		"Connection: close\r\n\r\n"
 		"<!doctype html><head>"
 		"<title>Created: §%s</title>"
 		"<meta charset=utf-8>"
 		"</head><body>"
 		"Created: <a href=\"dpi:/zet/%s\">§%s</a>"
 		"</body></html>"
 		, id, id, id, id);
 	close(req->fd);
 	return 0;
 }
 static int http_serve_not_found(struct http_request *req) {
 	dprintf(req->fd, "HTTP/1.0 200 OK\r\n"
 		"Connection: close\r\n\r\n"
 		"Not found\n");
 	close(req->fd);
 	return 0;
 }
 static int http_serve_zet(struct http_request *req) {
 	int rc;
 	char note_path[_POSIX_PATH_MAX];
 	char note_path_backup[_POSIX_PATH_MAX];
 	char *id = req->path + 1;
 	rc = parse_multipart(req);
 	if (rc < 0) {
 		write_buf(req->fd, "HTTP/1.0 400 Bad Request\r\n"
 			"Content-Type: text/plain\r\n"
 			"Connection: close\r\n\r\n"
 			"Unable to parse form submission");
 		close(req->fd);
 		return 0;
 	}
 	(void)snprintf(note_path, sizeof(note_path), "%s/%s", zet_dir, id);
 	(void)snprintf(note_path_backup, sizeof(note_path_backup), "%s/%s~", zet_dir, id);
 	rc = rename(note_path, note_path_backup);
 	if (rc < 0 && errno != ENOENT) warn("rename");
 	int note_fd = open(note_path, O_CREAT|O_WRONLY|O_TRUNC, 0640);
 	if (note_fd < 0) {
 		if (errno == ENOENT) return http_serve_not_found(req);
 		dprintf(req->fd, "HTTP/1.0 500 Internal Server Error\r\n"
 			"Content-Type: text/plain\r\n"
 			"Connection: close\r\n\r\n"
 			"Unable to open file: %s\n", strerror(errno));
 		close(req->fd);
 		return 0;
 	}
 	rc = save_part(req, note_fd);
 	if (rc < 0) {
 		dprintf(req->fd, "HTTP/1.0 200 OK\r\n"
 			"Content-Type: text/plain\r\n"
 			"Connection: close\r\n\r\n"
 			"Error saving: %s", strerror(errno));
 		close(req->fd);
 		return 0;
 	}
 	dprintf(req->fd, "HTTP/1.0 302 Found\r\n"
 		"Content-Type: text/html\r\n"
 		"Location: dpi:/zet/%s\r\n"
 		"Connection: close\r\n\r\n"
 		"<!doctype html><head>"
 		"<title>Saved: §%s</title>"
 		"<meta charset=utf-8>"
 		"</head><body>"
 		"Saved: <a href=\"dpi:/zet/%s\">§%s</a>"
 		"</body></html>"
 		, id, id, id, id);
 	close(req->fd);
 	return 0;
 }
 static int handle_http_client(int fd, int firstchar) {
 	int rc;
 	struct http_request req;
 	char buf[2048];
 	buf[0] = firstchar;
 	size_t len = sizeof(buf)-1;
 	rc = read_some(fd, (unsigned char *)buf+1, &len);
 	buf[len+1] = '\0';
 	len++;
 	if (rc < 0) { close(fd); return 0; }
 	char *nextline = next_line(buf);
 	req.method = buf;
 	req.path = strchr(buf, ' ');
 	if (req.path == NULL) { close(fd); return 0; }
 	*req.path++ = '\0';
 	req.http_version = strchr(req.path, ' ');
 	if (req.http_version != NULL) *req.http_version++ = '\0';
 	req.referer = NULL;
 	req.host = NULL;
 	req.content_length = -1;
 	req.content_type = NULL;
 	req.multipart_boundary = NULL;
 	char *line = nextline;
 	while (line != NULL) {
 		nextline = next_line(line);
 		if (!line[0]) break;
 		char *name = line;
 		char *value = strchr(line, ':');
 		if (value != NULL) {
 			*value++ = '\0';
 			while (*value == ' ') value++;
 		}
 		if (!strncmp(name, "Host", 3)) req.host = value;
 		else if (!strncmp(name, "Referer", 7)) req.referer = value;
 		else if (!strncmp(name, "Content-Length", 14)) req.content_length = atoi(value);
 		else if (!strncmp(name, "Content-Type", 14)) req.content_type = value;
 		// else fprintf(stderr, "%s = %s\n", name, value);
 		line = nextline;
 	}
 	if (req.content_type != NULL
 	  && !strncmp(req.content_type, "multipart/", 10)) {
 		char *subtype = req.content_type + 10;
 		char *boundary = strstr(subtype, "; boundary=");
 		if (boundary != NULL) {
 			*boundary = '\0';
 			boundary += 11;
 			if (boundary[0] == '"') {
 				boundary++;
 				char *end = strchr(boundary, '"');
 				if (end != NULL) *end = '\0';
 			}
 			*--boundary = '-';
 			*--boundary = '-';
 			req.multipart_boundary = boundary;
 		}
 	}
 	if (req.referer == NULL || strncmp(req.referer, server_url, strlen(server_url))) {
 		dprintf(fd, "HTTP/1.0 403 Forbidden\r\n"
 		        "Connection: close\r\n\r\n"
 		        "Invalid Referer\n");
 		close(fd);
 		return 0;
 	}
 	if (req.host != NULL && strcmp(req.host, server_hostname)) {
 		dprintf(fd, "HTTP/1.0 403 Forbidden\r\n"
 		        "Connection: close\r\n\r\n"
 		        "Invalid Host\n");
 		close(fd);
 		return 0;
 	}
 	ptrdiff_t offset = nextline - buf;
 	req.data = nextline;
 	req.full_data = NULL;
 	req.len = len - offset;
 	req.fd = fd;
 	parse_req_uri(req.path, &req.hash, &req.query);
 	if (!strcmp(req.path, "/")) return http_serve_index(&req);
 	if (!strcmp(req.path, "/new")) return http_serve_new(&req);
 	return http_serve_zet(&req);
 }
 static int handle_client(int server_fd) {
 	int fd;
 	do {
 		fd = accept(server_fd, NULL, NULL);
 		if (fd < 0 && errno != ENETDOWN    && errno != EPROTO
 		           && errno != ENOPROTOOPT && errno != EHOSTDOWN
 		           && errno != ENONET      && errno != EHOSTUNREACH
 		           && errno != EOPNOTSUPP  && errno != ENETUNREACH
 		) return -1;
 	} while (fd < 0);
 	int firstchar = read_char(fd);
 	if (firstchar < 0)  {
 		// ignore errno
 		close(fd);
 		return 0;
 	}
 	if (firstchar == '<') return handle_dpi_client(fd);
 	return handle_http_client(fd, firstchar);
 }
 void get_server_address() {
 	struct sockaddr_storage addr;
 	struct sockaddr *addrp = (struct sockaddr *)&addr;
 	socklen_t addr_len = sizeof(addr);
 	char host_buf[128];
 	const char *host;
 	unsigned short port;
 	int rc = getsockname(STDIN_FILENO, addrp, &addr_len);
 	if (rc < 0) err(1, "getsockname");
 	if (addr.ss_family == AF_INET) {
 		struct sockaddr_in *addr_in = (struct sockaddr_in *)&addr;
 		port = ntohs(addr_in->sin_port);
 		host = inet_ntop(AF_INET, &addr_in->sin_addr, host_buf, sizeof(host_buf));
 	} else if (addr.ss_family == AF_INET6) {
 		struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)&addr;
 		port = ntohs(addr_in6->sin6_port);
 		host = inet_ntop(AF_INET6, &addr_in6->sin6_addr, host_buf, sizeof(host_buf));
 	} else {
 		errx(1, "Unknown server address family: %d", addr.ss_family);
 	}
 	int wrote = snprintf(server_hostname, sizeof(server_hostname), "%s:%hu", host, port);
 	if (wrote <= 0 || wrote >= (int)sizeof(server_hostname)) {
 		errx(1, "Unable to write hostname");
 	}
 	wrote = snprintf(server_url, sizeof(server_url), "http://%s/", server_hostname);
 	if (wrote <= 0 || wrote >= (int)sizeof(server_url)) {
 		errx(1, "Unable to write local URL");
 	}
 }
 int main(int argc, char *argv[]) {
 	(void)argc;
 	(void)argv;
 	warnx("started");
 	const char *home = getenv("HOME");
 	int len = snprintf(zet_dir, sizeof(zet_dir), "%s/.zet", home);
 	if (len < 0 || len >= (int)sizeof(zet_dir)) {
 		err(1, "unable to build directory name");
 	}
 	// Since dpi requests don't support a request body, we POST via HTTP
 	// to our dpi server socket which is already listing on a local TCP port.
 	get_server_address();
 	// handle connections one at a time
 	while (handle_client(STDIN_FILENO) == 0);
 	warnx("exiting");
 }