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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
use std::sync::Arc;
use crate::common_metric_data::CommonMetricDataInternal;
use crate::error_recording::{record_error, test_get_num_recorded_errors, ErrorType};
use crate::metrics::Metric;
use crate::metrics::MetricType;
use crate::storage::StorageManager;
use crate::util::truncate_string_at_boundary_with_error;
use crate::CommonMetricData;
use crate::Glean;
// The maximum number of characters a URL Metric may have, before encoding.
const MAX_URL_LENGTH: usize = 8192;
/// A URL metric.
///
/// Record an Unicode string value a URL content.
/// The URL is length-limited to `MAX_URL_LENGTH` bytes.
#[derive(Clone, Debug)]
pub struct UrlMetric {
meta: Arc<CommonMetricDataInternal>,
}
impl MetricType for UrlMetric {
fn meta(&self) -> &CommonMetricDataInternal {
&self.meta
}
}
// IMPORTANT:
//
// When changing this implementation, make sure all the operations are
// also declared in the related trait in `../traits/`.
impl UrlMetric {
/// Creates a new string metric.
pub fn new(meta: CommonMetricData) -> Self {
Self {
meta: Arc::new(meta.into()),
}
}
fn is_valid_url_scheme(&self, value: String) -> bool {
let mut splits = value.split(':');
if let Some(scheme) = splits.next() {
if scheme.is_empty() {
return false;
}
let mut chars = scheme.chars();
// The list of characters allowed in the scheme is on
return chars.next().unwrap().is_ascii_alphabetic()
&& chars.all(|c| c.is_ascii_alphanumeric() || ['+', '-', '.'].contains(&c));
}
// No ':' found, this is not valid :)
false
}
/// Sets to the specified stringified URL.
///
/// # Arguments
///
/// * `value` - The stringified URL to set the metric to.
///
/// ## Notes
///
/// Truncates the value if it is longer than `MAX_URL_LENGTH` bytes and logs an error.
pub fn set<S: Into<String>>(&self, value: S) {
let value = value.into();
let metric = self.clone();
crate::launch_with_glean(move |glean| metric.set_sync(glean, value))
}
/// Sets to the specified stringified URL synchronously.
#[doc(hidden)]
pub fn set_sync<S: Into<String>>(&self, glean: &Glean, value: S) {
if !self.should_record(glean) {
return;
}
let s = truncate_string_at_boundary_with_error(glean, &self.meta, value, MAX_URL_LENGTH);
if s.starts_with("data:") {
record_error(
glean,
&self.meta,
ErrorType::InvalidValue,
"URL metric does not support data URLs.",
None,
);
return;
}
if !self.is_valid_url_scheme(s.clone()) {
let msg = format!("\"{}\" does not start with a valid URL scheme.", s);
record_error(glean, &self.meta, ErrorType::InvalidValue, msg, None);
return;
}
let value = Metric::Url(s);
glean.storage().record(glean, &self.meta, &value)
}
#[doc(hidden)]
pub(crate) fn get_value<'a, S: Into<Option<&'a str>>>(
&self,
glean: &Glean,
ping_name: S,
) -> Option<String> {
let queried_ping_name = ping_name
.into()
.unwrap_or_else(|| &self.meta().inner.send_in_pings[0]);
match StorageManager.snapshot_metric_for_test(
glean.storage(),
queried_ping_name,
&self.meta.identifier(glean),
self.meta.inner.lifetime,
) {
Some(Metric::Url(s)) => Some(s),
_ => None,
}
}
/// **Test-only API (exported for FFI purposes).**
///
/// Gets the currently stored value as a string.
///
/// This doesn't clear the stored value.
///
/// # Arguments
///
/// * `ping_name` - the optional name of the ping to retrieve the metric
/// for. Defaults to the first value in `send_in_pings`.
///
/// # Returns
///
/// The stored value or `None` if nothing stored.
pub fn test_get_value(&self, ping_name: Option<String>) -> Option<String> {
crate::block_on_dispatcher();
crate::core::with_glean(|glean| self.get_value(glean, ping_name.as_deref()))
}
/// **Exported for test purposes.**
///
/// Gets the number of recorded errors for the given metric and error type.
///
/// # Arguments
///
/// * `error` - The type of error
///
/// # Returns
///
/// The number of errors reported.
pub fn test_get_num_recorded_errors(&self, error: ErrorType) -> i32 {
crate::block_on_dispatcher();
crate::core::with_glean(|glean| {
test_get_num_recorded_errors(glean, self.meta(), error).unwrap_or(0)
})
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::tests::new_glean;
use crate::Lifetime;
#[test]
fn payload_is_correct() {
let (glean, _t) = new_glean(None);
let metric = UrlMetric::new(CommonMetricData {
name: "url_metric".into(),
category: "test".into(),
send_in_pings: vec!["store1".into()],
lifetime: Lifetime::Application,
disabled: false,
dynamic_label: None,
});
metric.set_sync(&glean, sample_url.clone());
assert_eq!(sample_url, metric.get_value(&glean, "store1").unwrap());
}
#[test]
fn does_not_record_url_exceeding_maximum_length() {
let (glean, _t) = new_glean(None);
let metric = UrlMetric::new(CommonMetricData {
name: "url_metric".into(),
category: "test".into(),
send_in_pings: vec!["store1".into()],
lifetime: Lifetime::Application,
disabled: false,
dynamic_label: None,
});
// Whenever the URL is longer than our MAX_URL_LENGTH, we truncate the URL to the
// MAX_URL_LENGTH.
//
// This 8-character string was chosen so we could have an even number that is
// a divisor of our MAX_URL_LENGTH.
let long_path_base = "abcdefgh";
// Using 2000 creates a string > 16000 characters, well over MAX_URL_LENGTH.
metric.set_sync(&glean, test_url);
// "glean://" is 8 characters
// "abcdefgh" (long_path_base) is 8 characters
// `long_path_base` is repeated 1023 times (8184)
// 8 + 8184 = 8192 (MAX_URL_LENGTH)
assert_eq!(metric.get_value(&glean, "store1").unwrap(), expected);
assert_eq!(
1,
test_get_num_recorded_errors(&glean, metric.meta(), ErrorType::InvalidOverflow)
.unwrap()
);
}
#[test]
fn does_not_record_data_urls() {
let (glean, _t) = new_glean(None);
let metric = UrlMetric::new(CommonMetricData {
name: "url_metric".into(),
category: "test".into(),
send_in_pings: vec!["store1".into()],
lifetime: Lifetime::Application,
disabled: false,
dynamic_label: None,
});
let test_url = "data:application/json";
metric.set_sync(&glean, test_url);
assert!(metric.get_value(&glean, "store1").is_none());
assert_eq!(
1,
test_get_num_recorded_errors(&glean, metric.meta(), ErrorType::InvalidValue).unwrap()
);
}
#[test]
fn url_validation_works_and_records_errors() {
let (glean, _t) = new_glean(None);
let metric = UrlMetric::new(CommonMetricData {
name: "url_metric".into(),
category: "test".into(),
send_in_pings: vec!["store1".into()],
lifetime: Lifetime::Application,
disabled: false,
dynamic_label: None,
});
let incorrects = vec![
"",
// Scheme may only start with upper or lowercase ASCII alpha[^1] character.
"1glean://test",
// Scheme may only have ASCII alphanumeric characters or the `-`, `.`, `+` characters.
"шеллы://test",
// Scheme must be followed by `:` character.
"glean//test",
];
let corrects = vec![
// The minimum URL
"g:",
// Empty body is fine
"glean://",
// "//" is actually not even necessary
"glean:",
"glean:test",
"glean:test.com",
// Scheme may only have ASCII alphanumeric characters or the `-`, `.`, `+` characters.
// Query parameters are fine
// Finally, some actual real world URLs
];
for incorrect in incorrects.clone().into_iter() {
metric.set_sync(&glean, incorrect);
assert!(metric.get_value(&glean, "store1").is_none());
}
assert_eq!(
incorrects.len(),
test_get_num_recorded_errors(&glean, metric.meta(), ErrorType::InvalidValue).unwrap()
as usize
);
for correct in corrects.into_iter() {
metric.set_sync(&glean, correct);
assert_eq!(metric.get_value(&glean, "store1").unwrap(), correct);
}
}
}