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

//! Pin functions.

use crate::request::{execute_get, CommonOptions, RequestError};
use crate::util::{make_url, str_to_bytes, URI_SKYNET_PREFIX};

use sp_std::{str, vec::Vec};

/// Pin error.
#[derive(Debug)]
pub enum PinError {
    /// Request error.
    RequestError(RequestError),
    /// UTF8 error.
    Utf8Error(str::Utf8Error),
    /// Validation error.
    ValidationError(Vec<u8>),
}

impl From<RequestError> for PinError {
    fn from(err: RequestError) -> Self {
        Self::RequestError(err)
    }
}

impl From<str::Utf8Error> for PinError {
    fn from(err: str::Utf8Error) -> Self {
        Self::Utf8Error(err)
    }
}

/// Pin options.
#[derive(Debug)]
pub struct PinOptions<'a> {
    /// Common options.
    pub common: CommonOptions<'a>,
    /// The endpoint to contact.
    pub endpoint_pin: &'a str,
}

impl Default for PinOptions<'_> {
    fn default() -> Self {
        Self {
            common: Default::default(),
            endpoint_pin: "/skynet/pin",
        }
    }
}

/// Re-pins the given `skylink`.
pub fn pin_skylink(skylink: &str, opts: Option<&PinOptions>) -> Result<Vec<u8>, PinError> {
    let default = Default::default();
    let opts = opts.unwrap_or(&default);

    // TODO: Implement full skylink parsing.
    let skylink = if let Some(stripped) = skylink.strip_prefix(URI_SKYNET_PREFIX) {
        stripped
    } else {
        skylink
    };

    let url = make_url(&[opts.common.portal_url, opts.endpoint_pin, skylink]);

    let mut response = execute_get(str::from_utf8(&url)?, &opts.common)?;

    let headers = response.headers();
    let skylink = headers
        .find("skynet-skylink")
        .or_else(|| headers.find("Skynet-Skylink"));

    if let Some(skylink) = skylink {
        Ok(str_to_bytes(skylink))
    } else {
        Err(PinError::ValidationError(str_to_bytes(
            "'skynet-skylink' header not found in response",
        )))
    }
}

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

    use sp_core::offchain::{testing, OffchainWorkerExt};
    use sp_io::TestExternalities;

    const DATA_LINK: &str = "MABdWWku6YETM2zooGCjQi26Rs4a6Hb74q26i-vMMcximQ";
    // const ENTRY_LINK: &str = "AQAZ1R-KcL4NO_xIVf0q8B1ngPVd6ec-Pu54O0Cto387Nw";

    #[test]
    fn should_pin_data_link() {
        let (offchain, state) = testing::TestOffchainExt::new();
        let mut t = TestExternalities::default();
        t.register_extension(OffchainWorkerExt::new(offchain));

        // Add expected request.
        state.write().expect_request(testing::PendingRequest {
            method: "GET".into(),
            uri: "https://siasky.net/skynet/pin/MABdWWku6YETM2zooGCjQi26Rs4a6Hb74q26i-vMMcximQ"
                .into(),
            response: Some(br#""#.to_vec()),
            response_headers: vec![("Skynet-Skylink".to_owned(), DATA_LINK.to_owned())],
            sent: true,
            ..Default::default()
        });

        t.execute_with(|| {
            // Call pin_skylink.
            let skylink_returned = pin_skylink(DATA_LINK, None).unwrap();

            // Check the response.
            assert_eq!(skylink_returned, str_to_bytes(DATA_LINK));
        })
    }

    // // TODO: Update test.
    // #[test]
    // fn should_fail_to_pin_entry_link() {
    //     let (offchain, state) = testing::TestOffchainExt::new();
    //     let mut t = TestExternalities::default();
    //     t.register_extension(OffchainExt::new(offchain));

    //     // Add expected request.
    //     state.write().expect_request(testing::PendingRequest {
    //         method: "GET".into(),
    //         uri: "https://siasky.net/skynet/pin/MABdWWku6YETM2zooGCjQi26Rs4a6Hb74q26i-vMMcximQ"
    //             .into(),
    //         response: Some(br#""#.to_vec()),
    //         response_headers: vec![("Skynet-Skylink".to_owned(), DATA_LINK.to_owned())],
    //         sent: true,
    //         ..Default::default()
    //     });

    //     t.execute_with(|| {
    //         // Call pin_skylink.
    //         let skylink_returned = pin_skylink(ENTRY_LINK, &Default::default()).unwrap();
    //     })
    // }
}