Line data Source code
1 : #![deny(unsafe_code)]
2 : #![deny(clippy::undocumented_unsafe_blocks)]
3 : use anyhow::{bail, Context};
4 : use itertools::Itertools;
5 : use std::borrow::Cow;
6 : use std::fmt;
7 : use url::Host;
8 :
9 : /// Parses a string of format either `host:port` or `host` into a corresponding pair.
10 : /// The `host` part should be a correct `url::Host`, while `port` (if present) should be
11 : /// a valid decimal u16 of digits only.
12 36 : pub fn parse_host_port<S: AsRef<str>>(host_port: S) -> Result<(Host, Option<u16>), anyhow::Error> {
13 36 : let (host, port) = match host_port.as_ref().rsplit_once(':') {
14 6 : Some((host, port)) => (
15 6 : host,
16 6 : // +80 is a valid u16, but not a valid port
17 14 : if port.chars().all(|c| c.is_ascii_digit()) {
18 4 : Some(port.parse::<u16>().context("Unable to parse port")?)
19 : } else {
20 2 : bail!("Port contains a non-ascii-digit")
21 : },
22 : ),
23 30 : None => (host_port.as_ref(), None), // No colons, no port specified
24 : };
25 34 : let host = Host::parse(host).context("Unable to parse host")?;
26 32 : Ok((host, port))
27 36 : }
28 :
29 : #[cfg(test)]
30 : mod tests_parse_host_port {
31 : use crate::parse_host_port;
32 : use url::Host;
33 :
34 : #[test]
35 2 : fn test_normal() {
36 2 : let (host, port) = parse_host_port("hello:123").unwrap();
37 2 : assert_eq!(host, Host::Domain("hello".to_owned()));
38 2 : assert_eq!(port, Some(123));
39 2 : }
40 :
41 : #[test]
42 2 : fn test_no_port() {
43 2 : let (host, port) = parse_host_port("hello").unwrap();
44 2 : assert_eq!(host, Host::Domain("hello".to_owned()));
45 2 : assert_eq!(port, None);
46 2 : }
47 :
48 : #[test]
49 2 : fn test_ipv6() {
50 2 : let (host, port) = parse_host_port("[::1]:123").unwrap();
51 2 : assert_eq!(host, Host::<String>::Ipv6(std::net::Ipv6Addr::LOCALHOST));
52 2 : assert_eq!(port, Some(123));
53 2 : }
54 :
55 : #[test]
56 2 : fn test_invalid_host() {
57 2 : assert!(parse_host_port("hello world").is_err());
58 2 : }
59 :
60 : #[test]
61 2 : fn test_invalid_port() {
62 2 : assert!(parse_host_port("hello:+80").is_err());
63 2 : }
64 : }
65 :
66 : #[derive(Clone)]
67 : pub struct PgConnectionConfig {
68 : host: Host,
69 : port: u16,
70 : password: Option<String>,
71 : options: Vec<String>,
72 : }
73 :
74 : /// A simplified PostgreSQL connection configuration. Supports only a subset of possible
75 : /// settings for simplicity. A password getter or `to_connection_string` methods are not
76 : /// added by design to avoid accidentally leaking password through logging, command line
77 : /// arguments to a child process, or likewise.
78 : impl PgConnectionConfig {
79 34 : pub fn new_host_port(host: Host, port: u16) -> Self {
80 34 : PgConnectionConfig {
81 34 : host,
82 34 : port,
83 34 : password: None,
84 34 : options: vec![],
85 34 : }
86 34 : }
87 :
88 30 : pub fn host(&self) -> &Host {
89 30 : &self.host
90 30 : }
91 :
92 16 : pub fn port(&self) -> u16 {
93 16 : self.port
94 16 : }
95 :
96 0 : pub fn set_host(mut self, h: Host) -> Self {
97 0 : self.host = h;
98 0 : self
99 0 : }
100 :
101 0 : pub fn set_port(mut self, p: u16) -> Self {
102 0 : self.port = p;
103 0 : self
104 0 : }
105 :
106 28 : pub fn set_password(mut self, s: Option<String>) -> Self {
107 28 : self.password = s;
108 28 : self
109 28 : }
110 :
111 32 : pub fn extend_options<I: IntoIterator<Item = S>, S: Into<String>>(mut self, i: I) -> Self {
112 90 : self.options.extend(i.into_iter().map(|s| s.into()));
113 32 : self
114 32 : }
115 :
116 : /// Return a `<host>:<port>` string.
117 8 : pub fn raw_address(&self) -> String {
118 8 : format!("{}:{}", self.host(), self.port())
119 8 : }
120 :
121 : /// Build a client library-specific connection configuration.
122 : /// Used for testing and when we need to add some obscure configuration
123 : /// elements at the last moment.
124 2 : pub fn to_tokio_postgres_config(&self) -> tokio_postgres::Config {
125 2 : // Use `tokio_postgres::Config` instead of `postgres::Config` because
126 2 : // the former supports more options to fiddle with later.
127 2 : let mut config = tokio_postgres::Config::new();
128 2 : config.host(&self.host().to_string()).port(self.port);
129 2 : if let Some(password) = &self.password {
130 0 : config.password(password);
131 2 : }
132 2 : if !self.options.is_empty() {
133 2 : // These options are command-line options and should be escaped before being passed
134 2 : // as an 'options' connection string parameter, see
135 2 : // https://www.postgresql.org/docs/15/libpq-connect.html#LIBPQ-CONNECT-OPTIONS
136 2 : //
137 2 : // They will be space-separated, so each space inside an option should be escaped,
138 2 : // and all backslashes should be escaped before that. Although we don't expect options
139 2 : // with spaces at the moment, they're supported by PostgreSQL. Hence we support them
140 2 : // in this typesafe interface.
141 2 : //
142 2 : // We use `Cow` to avoid allocations in the best case (no escaping). A fully imperative
143 2 : // solution would require 1-2 allocations in the worst case as well, but it's harder to
144 2 : // implement and this function is hardly a bottleneck. The function is only called around
145 2 : // establishing a new connection.
146 2 : #[allow(unstable_name_collisions)]
147 2 : config.options(
148 2 : &self
149 2 : .options
150 2 : .iter()
151 8 : .map(|s| {
152 8 : if s.contains(['\\', ' ']) {
153 4 : Cow::Owned(s.replace('\\', "\\\\").replace(' ', "\\ "))
154 : } else {
155 4 : Cow::Borrowed(s.as_str())
156 : }
157 8 : })
158 2 : .intersperse(Cow::Borrowed(" ")) // TODO: use impl from std once it's stabilized
159 2 : .collect::<String>(),
160 2 : );
161 2 : }
162 2 : config
163 2 : }
164 :
165 : /// Connect using postgres protocol with TLS disabled.
166 0 : pub async fn connect_no_tls(
167 0 : &self,
168 0 : ) -> Result<
169 0 : (
170 0 : tokio_postgres::Client,
171 0 : tokio_postgres::Connection<tokio_postgres::Socket, tokio_postgres::tls::NoTlsStream>,
172 0 : ),
173 0 : postgres::Error,
174 0 : > {
175 0 : self.to_tokio_postgres_config()
176 0 : .connect(postgres::NoTls)
177 0 : .await
178 0 : }
179 : }
180 :
181 : impl fmt::Display for PgConnectionConfig {
182 0 : fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
183 0 : // The password is intentionally hidden and not part of this display string.
184 0 : write!(f, "postgresql://{}:{}", self.host, self.port)
185 0 : }
186 : }
187 :
188 : impl fmt::Debug for PgConnectionConfig {
189 6 : fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
190 6 : // We want `password: Some(REDACTED-STRING)`, not `password: Some("REDACTED-STRING")`
191 6 : // so even if the password is `REDACTED-STRING` (quite unlikely) there is no confusion.
192 6 : // Hence `format_args!()`, it returns a "safe" string which is not escaped by `Debug`.
193 6 : f.debug_struct("PgConnectionConfig")
194 6 : .field("host", &self.host)
195 6 : .field("port", &self.port)
196 6 : .field(
197 6 : "password",
198 6 : &self
199 6 : .password
200 6 : .as_ref()
201 6 : .map(|_| format_args!("REDACTED-STRING")),
202 6 : )
203 6 : .finish()
204 6 : }
205 : }
206 :
207 : #[cfg(test)]
208 : mod tests_pg_connection_config {
209 : use crate::PgConnectionConfig;
210 : use once_cell::sync::Lazy;
211 : use url::Host;
212 :
213 6 : static STUB_HOST: Lazy<Host> = Lazy::new(|| Host::Domain("stub.host.example".to_owned()));
214 :
215 : #[test]
216 2 : fn test_no_password() {
217 2 : let cfg = PgConnectionConfig::new_host_port(STUB_HOST.clone(), 123);
218 2 : assert_eq!(cfg.host(), &*STUB_HOST);
219 2 : assert_eq!(cfg.port(), 123);
220 2 : assert_eq!(cfg.raw_address(), "stub.host.example:123");
221 2 : assert_eq!(
222 2 : format!("{:?}", cfg),
223 2 : "PgConnectionConfig { host: Domain(\"stub.host.example\"), port: 123, password: None }"
224 2 : );
225 2 : }
226 :
227 : #[test]
228 2 : fn test_ipv6() {
229 2 : // May be a special case because hostname contains a colon.
230 2 : let cfg = PgConnectionConfig::new_host_port(Host::parse("[::1]").unwrap(), 123);
231 2 : assert_eq!(
232 2 : cfg.host(),
233 2 : &Host::<String>::Ipv6(std::net::Ipv6Addr::LOCALHOST)
234 2 : );
235 2 : assert_eq!(cfg.port(), 123);
236 2 : assert_eq!(cfg.raw_address(), "[::1]:123");
237 2 : assert_eq!(
238 2 : format!("{:?}", cfg),
239 2 : "PgConnectionConfig { host: Ipv6(::1), port: 123, password: None }"
240 2 : );
241 2 : }
242 :
243 : #[test]
244 2 : fn test_with_password() {
245 2 : let cfg = PgConnectionConfig::new_host_port(STUB_HOST.clone(), 123)
246 2 : .set_password(Some("password".to_owned()));
247 2 : assert_eq!(cfg.host(), &*STUB_HOST);
248 2 : assert_eq!(cfg.port(), 123);
249 2 : assert_eq!(cfg.raw_address(), "stub.host.example:123");
250 2 : assert_eq!(
251 2 : format!("{:?}", cfg),
252 2 : "PgConnectionConfig { host: Domain(\"stub.host.example\"), port: 123, password: Some(REDACTED-STRING) }"
253 2 : );
254 2 : }
255 :
256 : #[test]
257 2 : fn test_with_options() {
258 2 : let cfg = PgConnectionConfig::new_host_port(STUB_HOST.clone(), 123).extend_options([
259 2 : "hello",
260 2 : "world",
261 2 : "with space",
262 2 : "and \\ backslashes",
263 2 : ]);
264 2 : assert_eq!(cfg.host(), &*STUB_HOST);
265 2 : assert_eq!(cfg.port(), 123);
266 2 : assert_eq!(cfg.raw_address(), "stub.host.example:123");
267 2 : assert_eq!(
268 2 : cfg.to_tokio_postgres_config().get_options(),
269 2 : Some("hello world with\\ space and\\ \\\\\\ backslashes")
270 2 : );
271 2 : }
272 : }
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