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

//! Simple Gist API wrapper
use std::collections::HashMap;

use chrono::{DateTime, Utc};
use color_eyre::Help;
use regex::Regex;

use crate::errors::LostTheWay;

const GITHUB_API_URL: &str = "https://api.github.com";
const GITHUB_BASE_PATH: &str = "";
const ACCEPT: &str = "application/vnd.github.v3+json";
const USER_AGENT: &str = "the-way";

/// Expects URL like `https://gist.github.com/user/<gist_id>`
/// or `https://gist.github.com/<gist_id>`
fn gist_id_from_url(gist_url: &str) -> color_eyre::Result<Option<&str>> {
    let re = Regex::new(r"https://gist\.github\.com/(.+/)?(?P<gist_id>[0-9a-f]+)$")?;
    Ok(re
        .captures(gist_url)
        .and_then(|cap| cap.name("gist_id").map(|gist_id| gist_id.as_str())))
}

/// Gist code content
#[derive(Serialize, Debug)]
pub struct GistContent<'a> {
    pub content: &'a str,
}

#[derive(Serialize, Debug)]
pub struct CreateGistPayload<'a> {
    pub description: &'a str,
    pub public: bool,
    pub files: HashMap<String, GistContent<'a>>,
}

#[derive(Serialize, Debug)]
pub struct UpdateGistPayload<'a> {
    pub description: &'a str,
    pub files: HashMap<String, Option<GistContent<'a>>>,
}

#[derive(Deserialize, Debug)]
pub struct Gist {
    pub html_url: String,
    pub id: String,
    pub updated_at: DateTime<Utc>,
    pub description: String,
    pub files: HashMap<String, GistFile>,
}

#[derive(Deserialize, Debug)]
pub struct GistFile {
    pub content: String,
    pub language: String,
}

pub struct GistClient<'a> {
    client: ureq::Agent,
    access_token: Option<&'a str>,
}

impl<'a> GistClient<'a> {
    /// Create a new Gist client
    pub fn new(access_token: Option<&'a str>) -> color_eyre::Result<Self> {
        Ok(Self {
            client: ureq::agent(),
            access_token,
        })
    }

    fn add_headers(&self, request: ureq::Request) -> ureq::Request {
        let mut request = request
            .set("user-agent", USER_AGENT)
            .set("content-type", ACCEPT);
        if let Some(access_token) = &self.access_token {
            request = request.set("Authorization", &format!("token {access_token}"));
        }
        request
    }

    fn get_response(response: Result<ureq::Response, ureq::Error>) -> color_eyre::Result<Gist> {
        match response {
            Ok(response) => {
                Ok(response
                    .into_json::<Gist>()
                    .map_err(|e| LostTheWay::SyncError {
                        message: format!("{e}"),
                    })?)
            }
            Err(ureq::Error::Status(code, response)) => Err(LostTheWay::SyncError {
                message: format!("{code} {}", response.into_string()?),
            })
            .suggestion(
                "Make sure your GitHub access token is valid.\n\
        Get one from https://github.com/settings/tokens/new (add the \"gist\" scope).\n\
        Set it to the environment variable $THE_WAY_GITHUB_TOKEN",
            ),
            Err(_) => Err(LostTheWay::SyncError {
                message: "io/transport error".into(),
            })
            .suggestion(
                "Make sure your GitHub access token is valid.\n\
        Get one from https://github.com/settings/tokens/new (add the \"gist\" scope).\n\
        Set it to the environment variable $THE_WAY_GITHUB_TOKEN",
            ),
        }
    }

    /// Create a new Gist with the given payload
    pub fn create_gist(&self, payload: &CreateGistPayload<'_>) -> color_eyre::Result<Gist> {
        let url = format!("{GITHUB_API_URL}{GITHUB_BASE_PATH}/gists");
        let response = self
            .add_headers(self.client.post(&url))
            .send_json(serde_json::to_value(payload)?);
        Self::get_response(response)
    }

    /// Update an existing Gist
    pub fn update_gist(
        &self,
        gist_id: &str,
        payload: &UpdateGistPayload<'_>,
    ) -> color_eyre::Result<Gist> {
        let url = format!("{GITHUB_API_URL}{GITHUB_BASE_PATH}/gists");
        let response = self
            .add_headers(self.client.request("PATCH", &format!("{url}/{gist_id}")))
            .send_json(serde_json::to_value(payload)?);
        Self::get_response(response)
    }

    /// Retrieve a Gist by ID
    pub fn get_gist(&self, gist_id: &str) -> color_eyre::Result<Gist> {
        let url = format!("{GITHUB_API_URL}{GITHUB_BASE_PATH}/gists");
        let response = self.add_headers(self.client.get(&format!("{url}/{gist_id}")));
        Self::get_response(response.call())
    }

    /// Retrieve a Gist by URL
    pub fn get_gist_by_url(&self, gist_url: &str) -> color_eyre::Result<Gist> {
        let gist_id = gist_id_from_url(gist_url)?;
        match gist_id {
            Some(gist_id) => self.get_gist(gist_id),
            None => Err(LostTheWay::GistUrlError {
                message: format!("Problem extracting gist ID from {gist_url}"),
            })
            .suggestion("The URL should look like https://gist.github.com/<user>/<gist_id>."),
        }
    }

    /// Delete Gist by ID
    pub fn delete_gist(&self, gist_id: &str) -> color_eyre::Result<()> {
        let url = format!("{GITHUB_API_URL}{GITHUB_BASE_PATH}/gists");
        let status = self.add_headers(self.client.delete(&format!("{url}/{gist_id}")));
        if status.call().is_err() {
            Err(LostTheWay::GistUrlError {
                message: format!("Couldn't delete gist with ID {gist_id}"),
            }
            .into())
        } else {
            Ok(())
        }
    }
}