1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
use crate::database::FeedConf;
use log::{debug, info};
use std::error::Error;
use feed_rs::parser;
use feed_rs::model;
use chrono::prelude::{Utc,DateTime};
use html2md;
extern crate mime;
/**
* Extract text field from Option
*/
fn extract_text(text: &Option<model::Text>, field: &str) -> String {
if text.is_none() { return String::from(format!("Field {:#?} was not in feed", field)); }
let field = text.as_ref().unwrap();
match (field.content_type.type_(), field.content_type.subtype()) {
(mime::TEXT, mime::HTML) => return html2md::parse_html(field.content.as_ref()),
(mime::TEXT, mime::PLAIN) => return field.content.to_owned(),
_ => return String::from(format!("Unknown field content type {:#?}", field.content_type)),
}
}
/**
* Extract string field from Option
*/
fn extract_string(text: &Option<String>, field: &str) -> String {
if text.is_none() { return String::from(format!("Field {:#?} was not in feed", field)); }
return text.as_ref().unwrap().to_owned();
}
/**
* Extract string field from Option
*/
fn extract_datetime(date: &Option<DateTime<Utc>>, field: &str) -> String {
if date.is_none() { return String::from(format!("Field {:#?} was not in feed", field)); }
return date.unwrap().to_rfc2822().replace("+0000", "UTC");
}
/**
* Turn a vector of feed_rs::model::Person into markdown.
*/
fn person_vec_to_md(person_vec: &Vec<model::Person>) -> String {
let mut md_str = "".to_owned();
for (i, person) in person_vec.iter().enumerate() {
if person.uri.is_some() && person.email.is_some() {
md_str.push_str(format!("[{}]({}) - [homepage]({})",
person.name,
person.email.as_ref().unwrap(),
person.uri.as_ref().unwrap()
).as_str());
} else if person.uri.is_some() {
md_str.push_str(format!("[{}]({})",
person.name,
person.uri.as_ref().unwrap(),
).as_str());
} else if person.email.is_some() {
md_str.push_str(format!("[{}]({})",
person.name,
person.email.as_ref().unwrap(),
).as_str());
} else {
md_str.push_str(&person.name);
}
if i < (person_vec.len() - 1) { md_str.push_str(", "); }
}
return md_str;
}
/**
* Turn a vector of feed_rs::model::Link into markdown.
*/
fn link_vec_to_md(link_vec: &Vec<model::Link>) -> String {
let mut md_str = "".to_owned();
for (i, link) in link_vec.iter().enumerate() {
if link.title.is_some() {
md_str.push_str(format!("[{}]({})",
&link.title.as_ref().unwrap(),
&link.href).as_str());
} else if link.rel.is_some() {
md_str.push_str(format!("[{}]({})",
&link.rel.as_ref().unwrap(),
&link.href).as_str());
} else {
md_str.push_str(format!("[{}]({})",
&link.href,
&link.href).as_str());
}
if i < (link_vec.len() - 1) { md_str.push_str(", "); }
}
return md_str;
}
/**
* Turn a vector of feed_rs::model::Category into markdown.
*/
fn category_vec_to_md(category_vec: &Vec<model::Category>) -> String {
let mut md_str = "".to_owned();
for (i, category) in category_vec.iter().enumerate() {
if category.label.is_some() {
md_str.push_str(category.label.as_ref().unwrap());
} else {
md_str.push_str(&category.term);
}
if i < (category_vec.len() - 1) { md_str.push_str(", "); }
}
return md_str;
}
/**
* This will replace a given field with the appropriate formatted string from
* the rss feed/entry/item.
*/
fn fill_template_field(field: &str, entry: &model::Entry, feed: &model::Feed) -> String {
match field {
"id" => return feed.id.to_owned(),
"title" => return extract_text(&feed.title, field).to_owned(),
"updated" => return extract_datetime(&feed.updated, field).to_owned(),
"authors" => return person_vec_to_md(&feed.authors).to_owned(),
"description" => return extract_text(&feed.description, field).to_owned(),
"links" => return link_vec_to_md(&feed.links).to_owned(),
"categories" => return category_vec_to_md(&feed.categories).to_owned(),
"contributors" => return person_vec_to_md(&feed.contributors).to_owned(),
"language" => return extract_string(&feed.language, field).to_owned(),
"published" => return extract_datetime(&feed.published, field).to_owned(),
"rights" => return extract_text(&feed.rights, field).to_owned(),
"entry.id" => return entry.id.to_owned(),
"entry.title" => return extract_text(&entry.title, field).to_owned(),
"entry.updated" => return extract_datetime(&entry.updated, field).to_owned(),
"entry.authors" => return person_vec_to_md(&entry.authors).to_owned(),
"entry.links" => return link_vec_to_md(&entry.links).to_owned(),
"entry.summary" => return extract_text(&entry.summary, field).to_owned(),
"entry.categories" => return category_vec_to_md(&entry.categories).to_owned(),
"entry.contributors" => return person_vec_to_md(&entry.contributors).to_owned(),
"entry.published" => return extract_datetime(&entry.published, field).to_owned(),
"entry.source" => return extract_string(&entry.source, field).to_owned(),
"entry.rights" => return extract_text(&entry.rights, field).to_owned(),
_ => return String::from(format!("Unknown field {:#?}", field))
}
}
/**
* Method that escapes some characters that would break json spec, and also escape
* special HTML characters.
*/
pub fn escape(input: String) -> String {
return input.replace("\\","\\\\")
.replace("\"", "\\\"")
.replace("\n", "\\n")
.replace("<", "<")
.replace(">", ">")
.replace("&", "$amp;");
}
/**
* This will find fields in the template string and use fill_template_field
* to replace the tags with formatted text from the rss feed/entry/item.
* It does use the escape function on the string it returns.
*/
pub fn fill_template(template_str: &str, entry: &model::Entry, feed: &model::Feed) -> String {
let mut filled_str = "".to_owned();
let mut l_bracket_n = 0;
let mut r_bracket_n = 0;
let mut field = "".to_owned();
for c in template_str.chars() {
if l_bracket_n > 1 {
if c == '}' {
r_bracket_n += 1;
if r_bracket_n > 1 {
filled_str.push_str(fill_template_field(&field,
&entry,
&feed).as_str());
field = "".to_owned();
r_bracket_n = 0;
l_bracket_n = 0;
}
} else {
field.push(c);
}
} else if c == '{' {
l_bracket_n += 1;
if l_bracket_n > 1 { field = "".to_owned(); }
} else {
l_bracket_n = 0;
filled_str.push(c);
}
}
return escape(filled_str).to_owned();
}
/**
* Function takes a FeedConf struct, and makes a get request to fetch
* the feed. It then uses feed_rs to parse that feed and returns that
* parsed feed.
*/
pub async fn fetch_feed(feed_conf: &FeedConf, last_fetch_time: DateTime<Utc>) -> Result<Option<model::Feed>, Box<dyn Error>> {
info!("Fetching feed \"{}\"", &feed_conf.url);
let client = reqwest::Client::new();
let last_fetch_rfc2822 = last_fetch_time.to_rfc2822().replace("+0000", "GMT");
debug!("Using header \"If-Modified-Since {:?}\"", &last_fetch_rfc2822);
let resp = client.get(&feed_conf.url)
.header("If-Modified-Since", &last_fetch_rfc2822)
.send()
.await?;
if resp.status() == 304 {
info!("No changes since last fetch at {}", &last_fetch_rfc2822);
Ok(None)
} else {
let feed = parser::parse(&resp.bytes().await?[..])?;
debug!("{:#?}", feed);
Ok(Some(feed))
}
}
|
