webbundle 0.5.1

WebBundle library
Documentation 
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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use crate::bundle::{Bundle, Exchange, Uri, Version};
use crate::prelude::*;

/// A Bundle builder.
#[derive(Default)]
pub struct Builder {
    version: Option<Version>,
    primary_url: Option<Uri>,
    manifest: Option<Uri>,
    pub(crate) exchanges: Vec<Exchange>,
}

impl Builder {
    pub(crate) fn new() -> Self {
        Default::default()
    }

    /// Sets the version.
    pub fn version(mut self, version: Version) -> Self {
        self.version = Some(version);
        self
    }

    /// Sets the primary url.
    pub fn primary_url(mut self, primary_url: Uri) -> Self {
        self.primary_url = Some(primary_url);
        self
    }

    /// Sets the manifest url.
    pub fn manifest(mut self, manifest: Uri) -> Self {
        self.manifest = Some(manifest);
        self
    }

    /// Adds the exchange.
    pub fn exchange(mut self, exchange: Exchange) -> Self {
        self.exchanges.push(exchange);
        self
    }

    /// Builds the bundle.
    pub fn build(self) -> Result<Bundle> {
        Ok(Bundle {
            version: self.version.context("no version")?,
            primary_url: self.primary_url,
            exchanges: self.exchanges,
        })
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn build_invalid_bundle() -> Result<()> {
        assert!(Builder::new().build().is_err());
        assert!(Builder::new()
            .primary_url("https://example.com/".parse()?)
            .build()
            .is_err());
        Ok(())
    }

    #[test]
    fn build() -> Result<()> {
        let bundle = Builder::new()
            .version(Version::VersionB2)
            .primary_url("https://example.com".parse()?)
            .build()?;
        assert_eq!(bundle.version, Version::VersionB2);
        assert_eq!(
            bundle.primary_url,
            Some("https://example.com".parse::<Uri>()?)
        );
        Ok(())
    }

    #[test]
    fn build_exchange() -> Result<()> {
        let bundle = Builder::new()
            .version(Version::VersionB2)
            .primary_url("https://example.com/index.html".parse()?)
            .exchange(Exchange::from((
                "https://example.com/index.html".to_string(),
                vec![],
            )))
            .build()?;
        assert_eq!(bundle.exchanges.len(), 1);
        assert_eq!(
            bundle.exchanges[0].request.url(),
            "https://example.com/index.html"
        );
        Ok(())
    }
}