amagi 0.1.2

Rust SDK, CLI, and Web API service skeleton for multi-platform social web adapters.
Documentation 
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

use std::collections::BTreeMap;

use reqwest::Url;

use crate::error::AppError;

use super::helpers::build_kuaishou_hxfalcon_sign_input;
use super::state::reserve_kuaishou_runtime_state;
use super::{
    derive_kuaishou_kww, derive_kuaishou_pure_signature, derive_kuaishou_secs_state,
    types::{
        KuaishouGeneratedHxfalcon, KuaishouHxfalconPayload, KuaishouLiveApiRequest,
        KuaishouLiveApiSignature, KuaishouPureSignContext,
    },
};

fn current_timestamp_millis() -> u64 {
    std::time::SystemTime::now()
        .duration_since(std::time::UNIX_EPOCH)
        .unwrap_or_default()
        .as_millis() as u64
}

fn next_random_fraction() -> f64 {
    let value = current_timestamp_millis()
        .wrapping_mul(1_103_515_245)
        .wrapping_add(12_345);
    let normalized = (value >> 11) & ((1u64 << 53) - 1);

    normalized as f64 / ((1u64 << 53) as f64)
}

fn set_query_param(url: &mut Url, key: &str, value: &str) {
    let mut updated = false;
    let mut pairs = Vec::new();

    for (existing_key, existing_value) in url.query_pairs() {
        if existing_key == key {
            if !updated {
                pairs.push((existing_key.into_owned(), value.to_owned()));
                updated = true;
            }
        } else {
            pairs.push((existing_key.into_owned(), existing_value.into_owned()));
        }
    }

    if !updated {
        pairs.push((key.to_owned(), value.to_owned()));
    }

    url.set_query(None);
    let mut query_pairs = url.query_pairs_mut();

    for (pair_key, pair_value) in pairs {
        query_pairs.append_pair(&pair_key, &pair_value);
    }
}

fn build_signed_live_api_url(
    url: &str,
    cookie: Option<&str>,
    cat_version: &str,
    sign_result: &str,
) -> Result<(String, BTreeMap<String, String>), AppError> {
    let mut signed_url = Url::parse(url).map_err(|error| {
        AppError::InvalidRequestConfig(format!("Invalid Kuaishou live_api URL {url}: {error}"))
    })?;
    let mut headers = BTreeMap::new();
    let kww = derive_kuaishou_kww(cookie);

    set_query_param(&mut signed_url, "__NS_hxfalcon", sign_result);
    set_query_param(&mut signed_url, "caver", cat_version);

    if !kww.is_empty() {
        headers.insert("kww".to_owned(), kww);
    }

    Ok((signed_url.to_string(), headers))
}

/// Return the current Kuaishou pure-sign `caver` value.
pub fn get_cat_version() -> String {
    super::get_kuaishou_pure_runtime_state().cat_version
}

/// Generate the Kuaishou `kww` header value from the cookie or anonymous fallback.
pub fn generate_kww(cookie: Option<&str>) -> String {
    derive_kuaishou_kww(cookie)
}

/// Generate `__NS_hxfalcon` materials from a normalized payload.
pub fn generate_hxfalcon_from_payload(
    payload: &KuaishouHxfalconPayload,
) -> KuaishouGeneratedHxfalcon {
    let sign_input = build_kuaishou_hxfalcon_sign_input(payload);
    let runtime_state = reserve_kuaishou_runtime_state();
    let cat_version = runtime_state.cat_version.clone();
    let sign_result = derive_kuaishou_pure_signature(&KuaishouPureSignContext {
        count: runtime_state.count,
        script_count: Some(0),
        secs: Some(derive_kuaishou_secs_state(runtime_state.count, None)),
        random_value: next_random_fraction(),
        sign_input: sign_input.clone(),
        startup_random: runtime_state.startup_random,
        timestamp: current_timestamp_millis(),
    })
    .sign_result;

    KuaishouGeneratedHxfalcon {
        sign_result,
        sign_input,
        cat_version,
    }
}

/// Sign a Kuaishou `live_api` URL.
pub fn sign_live_api_url(
    url: &str,
    cookie: Option<&str>,
    sign_path: Option<&str>,
) -> Result<KuaishouLiveApiSignature, AppError> {
    let payload = super::build_kuaishou_hxfalcon_payload(url, sign_path)?;
    let generated = generate_hxfalcon_from_payload(&payload);
    let (url, headers) =
        build_signed_live_api_url(url, cookie, &generated.cat_version, &generated.sign_result)?;

    Ok(KuaishouLiveApiSignature {
        url,
        headers,
        sign_result: generated.sign_result,
        sign_input: generated.sign_input,
        cat_version: generated.cat_version,
    })
}

/// Sign a structured Kuaishou `live_api` request description.
pub fn sign_live_api_request(
    request: &KuaishouLiveApiRequest,
    cookie: Option<&str>,
) -> Result<KuaishouLiveApiSignature, AppError> {
    sign_live_api_url(&request.url, cookie, request.sign_path.as_deref())
}