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#include <rsspp.h>
#include <rsspp_internal.h>
#include <rss_parser.h>
#include <configcontainer.h>
#include <cache.h>
#include <rss.h>
#include <logger.h>
#include <utils.h>
#include <config.h>
#include <htmlrenderer.h>
#include <ttrss_api.h>
#include <curl/curl.h>
#include <cerrno>
#include <cstring>
#include <sstream>
#include <algorithm>
namespace newsbeuter {
rss_parser::rss_parser(const std::string& uri, cache * c, configcontainer * cfg, rss_ignores * ii, remote_api * a)
: my_uri(uri), ch(c), cfgcont(cfg), skip_parsing(false), is_valid(false), ign(ii), api(a) {
is_ttrss = cfgcont->get_configvalue("urls-source") == "ttrss";
}
rss_parser::~rss_parser() { }
std::tr1::shared_ptr<rss_feed> rss_parser::parse() {
std::tr1::shared_ptr<rss_feed> feed(new rss_feed(ch));
feed->set_rssurl(my_uri);
retrieve_uri(my_uri);
if (!skip_parsing && is_valid) {
/*
* After parsing is done, we fill our feed object with title,
* description, etc. It's important to note that all data that comes
* from rsspp must be converted to UTF-8 before, because all data is
* internally stored as UTF-8, and converted on-the-fly in case some
* other encoding is required. This is because UTF-8 can hold all
* available Unicode characters, unlike other non-Unicode encodings.
*/
fill_feed_fields(feed);
fill_feed_items(feed);
feed->remove_old_deleted_items();
}
feed->set_empty(false);
return feed;
}
time_t rss_parser::parse_date(const std::string& datestr) {
time_t t = curl_getdate(datestr.c_str(), NULL);
if (t == -1) {
LOG(LOG_INFO, "rss_parser::parse_date: encountered t == -1, trying out W3CDTF parser...");
t = curl_getdate(rsspp::rss_parser::__w3cdtf_to_rfc822(datestr).c_str(), NULL);
}
if (t == -1) {
LOG(LOG_INFO, "rss_parser::parse_date: still t == -1, setting to current time");
t = ::time(NULL);
}
return t;
}
void rss_parser::replace_newline_characters(std::string& str) {
str = utils::replace_all(str, "\r", " ");
str = utils::replace_all(str, "\n", " ");
utils::trim(str);
}
std::string rss_parser::render_xhtml_title(const std::string& title, const std::string& link) {
htmlrenderer rnd(1 << 16, true); // a huge number
std::vector<std::string> lines;
std::vector<linkpair> links; // not needed
rnd.render(title, lines, links, link);
if (!lines.empty())
return lines[0];
return "";
}
void rss_parser::set_rtl(std::tr1::shared_ptr<rss_feed> feed, const char * lang) {
// we implement right-to-left support for the languages listed in
// http://blogs.msdn.com/rssteam/archive/2007/05/17/reading-feeds-in-right-to-left-order.aspx
static const char * rtl_langprefix[] = {
"ar", // Arabic
"fa", // Farsi
"ur", // Urdu
"ps", // Pashtu
"syr", // Syriac
"dv", // Divehi
"he", // Hebrew
"yi", // Yiddish
NULL };
for (unsigned int i=0;rtl_langprefix[i]!=NULL;++i) {
if (strncmp(lang,rtl_langprefix[i],strlen(rtl_langprefix[i]))==0) {
LOG(LOG_DEBUG, "rss_parser::parse: detected right-to-left order, language code = %s", rtl_langprefix[i]);
feed->set_rtl(true);
break;
}
}
}
void rss_parser::retrieve_uri(const std::string& uri) {
/*
* - http:// and https:// URLs are downloaded and parsed regularly
* - exec: URLs are executed and their output is parsed
* - filter: URLs are downloaded, executed, and their output is parsed
* - query: URLs are ignored
*/
if (is_ttrss) {
const char * uri = my_uri.c_str();
const char * pound = strrchr(uri, '#');
if (pound != NULL) {
fetch_ttrss(pound+1);
}
} else if (uri.substr(0,5) == "http:" || uri.substr(0,6) == "https:") {
download_http(uri);
} else if (uri.substr(0,5) == "exec:") {
get_execplugin(uri.substr(5,uri.length()-5));
} else if (uri.substr(0,7) == "filter:") {
std::string filter, url;
utils::extract_filter(uri, filter, url);
download_filterplugin(filter, url);
} else if (my_uri.substr(0,6) == "query:") {
skip_parsing = true;
} else if (my_uri.substr(0,7) == "file://") {
parse_file(my_uri.substr(7, my_uri.length()-7));
} else
throw utils::strprintf(_("Error: unsupported URL: %s"), my_uri.c_str());
}
void rss_parser::download_http(const std::string& uri) {
unsigned int retrycount = cfgcont->get_configvalue_as_int("download-retries");
char * proxy = NULL;
char * proxy_auth = NULL;
std::string proxy_type;
is_valid = false;
if (cfgcont->get_configvalue_as_bool("use-proxy") == true) {
proxy = const_cast<char *>(cfgcont->get_configvalue("proxy").c_str());
proxy_auth = const_cast<char *>(cfgcont->get_configvalue("proxy-auth").c_str());
proxy_type = cfgcont->get_configvalue("proxy-type");
}
for (unsigned int i=0;i<retrycount && !is_valid;i++) {
try {
std::string useragent = utils::get_useragent(cfgcont);
LOG(LOG_DEBUG, "rss_parser::download_http: user-agent = %s", useragent.c_str());
rsspp::parser p(cfgcont->get_configvalue_as_int("download-timeout"), useragent.c_str(), proxy, proxy_auth, utils::get_proxy_type(proxy_type));
time_t lm = 0;
std::string etag;
if (!ign || !ign->matches_lastmodified(uri)) {
ch->fetch_lastmodified(uri, lm, etag);
}
f = p.parse_url(uri, lm, etag, api, cfgcont->get_configvalue("cookie-cache"));
LOG(LOG_DEBUG, "rss_parser::download_http: lm = %d etag = %s", p.get_last_modified(), p.get_etag().c_str());
if (p.get_last_modified() != 0 || p.get_etag().length() > 0) {
LOG(LOG_DEBUG, "rss_parser::download_http: lastmodified old: %d new: %d", lm, p.get_last_modified());
LOG(LOG_DEBUG, "rss_parser::download_http: etag old: %s new %s", etag.c_str(), p.get_etag().c_str());
ch->update_lastmodified(uri, (p.get_last_modified() != lm) ? p.get_last_modified() : 0 , (etag != p.get_etag()) ? p.get_etag() : "");
}
is_valid = true;
} catch (rsspp::exception& e) {
is_valid = false;
throw e;
}
}
LOG(LOG_DEBUG, "rss_parser::parse: http URL %s, is_valid = %s", uri.c_str(), is_valid ? "true" : "false");
}
void rss_parser::get_execplugin(const std::string& plugin) {
std::string buf = utils::get_command_output(plugin);
is_valid = false;
try {
rsspp::parser p;
f = p.parse_buffer(buf.c_str(), buf.length());
is_valid = true;
} catch (rsspp::exception& e) {
is_valid = false;
throw e;
}
LOG(LOG_DEBUG, "rss_parser::parse: execplugin %s, is_valid = %s", plugin.c_str(), is_valid ? "true" : "false");
}
void rss_parser::parse_file(const std::string& file) {
is_valid = false;
try {
rsspp::parser p;
f = p.parse_file(file);
is_valid = true;
} catch (rsspp::exception& e) {
is_valid = false;
throw e;
}
LOG(LOG_DEBUG, "rss_parser::parse: parsed file %s, is_valid = %s", file.c_str(), is_valid ? "true" : "false");
}
void rss_parser::download_filterplugin(const std::string& filter, const std::string& uri) {
std::string buf = utils::retrieve_url(uri, cfgcont);
char * argv[4] = { const_cast<char *>("/bin/sh"), const_cast<char *>("-c"), const_cast<char *>(filter.c_str()), NULL };
std::string result = utils::run_program(argv, buf);
LOG(LOG_DEBUG, "rss_parser::parse: output of `%s' is: %s", filter.c_str(), result.c_str());
is_valid = false;
try {
rsspp::parser p;
f = p.parse_buffer(result.c_str(), result.length());
is_valid = true;
} catch (rsspp::exception& e) {
is_valid = false;
throw e;
}
LOG(LOG_DEBUG, "rss_parser::parse: filterplugin %s, is_valid = %s", filter.c_str(), is_valid ? "true" : "false");
}
void rss_parser::fill_feed_fields(std::tr1::shared_ptr<rss_feed> feed) {
/*
* we fill all the feed members with the appropriate values from the rsspp data structure
*/
if (is_html_type(f.title_type)) {
feed->set_title(render_xhtml_title(f.title, feed->link()));
} else {
feed->set_title(f.title);
}
feed->set_description(f.description);
feed->set_link(utils::absolute_url(my_uri, f.link));
if (f.pubDate != "")
feed->set_pubDate(parse_date(f.pubDate));
else
feed->set_pubDate(::time(NULL));
set_rtl(feed, f.language.c_str());
LOG(LOG_DEBUG, "rss_parser::parse: feed title = `%s' link = `%s'", feed->title().c_str(), feed->link().c_str());
}
void rss_parser::fill_feed_items(std::tr1::shared_ptr<rss_feed> feed) {
/*
* we iterate over all items of a feed, create an rss_item object for
* each item, and fill it with the appropriate values from the data structure.
*/
for (std::vector<rsspp::item>::iterator item=f.items.begin();item!=f.items.end();++item) {
std::tr1::shared_ptr<rss_item> x(new rss_item(ch));
set_item_title(feed, x, *item);
if (item->link != "") {
x->set_link(utils::absolute_url(feed->link(), item->link));
}
if (x->link().empty() && item->guid_isPermaLink) {
x->set_link(item->guid);
}
set_item_author(x, *item);
x->set_feedurl(feed->rssurl());
if ((f.rss_version == rsspp::ATOM_1_0 || f.rss_version == rsspp::TTRSS_JSON) && item->labels.size() > 0) {
std::vector<std::string>::const_iterator start, finish;
start = item->labels.begin();
finish = item->labels.end();
if (std::find(start, finish, "fresh") != finish) {
x->set_unread_nowrite(true);
x->set_override_unread(true);
}
if (std::find(start, finish, "kept-unread") != finish) {
x->set_unread_nowrite(true);
x->set_override_unread(true);
}
if (std::find(start, finish, "read") != finish) {
x->set_unread_nowrite(false);
x->set_override_unread(true);
}
if (std::find(start, finish, "ttrss:unread") != finish) {
x->set_unread_nowrite(true);
x->set_override_unread(true);
}
if (std::find(start, finish, "ttrss:read") != finish) {
x->set_unread_nowrite(false);
x->set_override_unread(true);
}
}
set_item_content(x, *item);
if (item->pubDate != "")
x->set_pubDate(parse_date(item->pubDate));
else
x->set_pubDate(::time(NULL));
x->set_guid(get_guid(*item));
x->set_base(item->base);
set_item_enclosure(x, *item);
LOG(LOG_DEBUG, "rss_parser::parse: item title = `%s' link = `%s' pubDate = `%s' (%d) description = `%s'", x->title().c_str(),
x->link().c_str(), x->pubDate().c_str(), x->pubDate_timestamp(), x->description().c_str());
add_item_to_feed(feed, x);
}
}
void rss_parser::set_item_title(std::tr1::shared_ptr<rss_feed> feed, std::tr1::shared_ptr<rss_item> x, rsspp::item& item) {
if (is_html_type(item.title_type)) {
x->set_title(render_xhtml_title(item.title, feed->link()));
} else {
std::string title = item.title;
replace_newline_characters(title);
x->set_title(title);
}
}
void rss_parser::set_item_author(std::tr1::shared_ptr<rss_item> x, rsspp::item& item) {
/*
* some feeds only have a feed-wide managingEditor, which we use as an item's
* author if there is no item-specific one available.
*/
if (item.author == "") {
if (f.managingeditor != "")
x->set_author(f.managingeditor);
else {
x->set_author(f.dc_creator);
}
} else {
x->set_author(item.author);
}
}
void rss_parser::set_item_content(std::tr1::shared_ptr<rss_item> x, rsspp::item& item) {
handle_content_encoded(x, item);
handle_itunes_summary(x, item);
if (x->description() == "") {
x->set_description(item.description);
} else {
if (cfgcont->get_configvalue_as_bool("always-display-description") && item.description != "")
x->set_description(x->description() + "<hr>" + item.description);
}
/* if it's still empty and we shall download the full page, then we do so. */
if (x->description() == "" && cfgcont->get_configvalue_as_bool("download-full-page") && x->link() != "") {
x->set_description(utils::retrieve_url(x->link(), cfgcont));
}
LOG(LOG_DEBUG, "rss_parser::set_item_content: content = %s", x->description().c_str());
}
std::string rss_parser::get_guid(rsspp::item& item) {
/*
* We try to find a GUID (some unique identifier) for an item. If the regular
* GUID is not available (oh, well, there are a few broken feeds around, after
* all), we try out the link and the title, instead. This is suboptimal, of course,
* because it makes it impossible to recognize duplicates when the title or the
* link changes.
*/
if (item.guid != "")
return item.guid;
else if (item.link != "")
return item.link;
else if (item.title != "")
return item.title;
else
return ""; // too bad.
}
void rss_parser::set_item_enclosure(std::tr1::shared_ptr<rss_item> x, rsspp::item& item) {
x->set_enclosure_url(item.enclosure_url);
x->set_enclosure_type(item.enclosure_type);
LOG(LOG_DEBUG, "rss_parser::parse: found enclosure_url: %s", item.enclosure_url.c_str());
LOG(LOG_DEBUG, "rss_parser::parse: found enclosure_type: %s", item.enclosure_type.c_str());
}
void rss_parser::add_item_to_feed(std::tr1::shared_ptr<rss_feed> feed, std::tr1::shared_ptr<rss_item> item) {
// only add item to feed if it isn't on the ignore list or if there is no ignore list
if (!ign || !ign->matches(item.get())) {
feed->add_item(item);
LOG(LOG_INFO, "rss_parser::parse: added article title = `%s' link = `%s' ign = %p", item->title().c_str(), item->link().c_str(), ign);
} else {
LOG(LOG_INFO, "rss_parser::parse: ignored article title = `%s' link = `%s'", item->title().c_str(), item->link().c_str());
}
}
void rss_parser::handle_content_encoded(std::tr1::shared_ptr<rss_item> x, rsspp::item& item) {
if (x->description() != "")
return;
/* here we handle content:encoded tags that are an extension but very widespread */
if (item.content_encoded != "") {
x->set_description(item.content_encoded);
} else {
LOG(LOG_DEBUG, "rss_parser::parse: found no content:encoded");
}
}
void rss_parser::handle_itunes_summary(std::tr1::shared_ptr<rss_item> x, rsspp::item& item) {
if (x->description() != "")
return;
std::string summary = item.itunes_summary;
if (summary != "") {
std::string desc = "<ituneshack>";
desc.append(summary);
desc.append("</ituneshack>");
x->set_description(desc);
}
}
bool rss_parser::is_html_type(const std::string& type) {
return (type == "html" || type == "xhtml" || type == "application/xhtml+xml");
}
void rss_parser::fetch_ttrss(const std::string& feed_id) {
ttrss_api * tapi = dynamic_cast<ttrss_api *>(api);
if (tapi) {
f = tapi->fetch_feed(feed_id);
is_valid = true;
}
LOG(LOG_DEBUG, "rss_parser::fetch_ttrss: f.items.size = %u", f.items.size());
}
}
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