zai-rs 0.1.15

一个 Rust SDK, 用于调用 智普AI API
Documentation 
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use std::path::PathBuf;

use super::request::FilePurpose;
use crate::client::http::HttpClient;

/// File upload request (multipart/form-data)
///
/// Sends a multipart request with fields:
/// - purpose: `FilePurpose`
/// - file: file content
pub struct FileUploadRequest {
    pub key: String,
    purpose: FilePurpose,
    file_path: PathBuf,
    file_name: Option<String>,
    content_type: Option<String>,
}

impl FileUploadRequest {
    pub fn new(key: String, purpose: FilePurpose, file_path: impl Into<PathBuf>) -> Self {
        Self {
            key,
            purpose,
            file_path: file_path.into(),
            file_name: None,
            content_type: None,
        }
    }

    pub fn with_file_name(mut self, name: impl Into<String>) -> Self {
        self.file_name = Some(name.into());
        self
    }

    pub fn with_content_type(mut self, ct: impl Into<String>) -> Self {
        self.content_type = Some(ct.into());

        self
    }

    /// Send the upload request and parse typed response (`FileObject`)
    pub async fn send(&self) -> crate::ZaiResult<super::response::FileObject> {
        let resp: reqwest::Response = self.post().await?;
        let parsed = resp.json::<super::response::FileObject>().await?;
        Ok(parsed)
    }
}

impl HttpClient for FileUploadRequest {
    type Body = (); // unused
    type ApiUrl = &'static str;
    type ApiKey = String;

    fn api_url(&self) -> &Self::ApiUrl {
        &"https://open.bigmodel.cn/api/paas/v4/files"
    }
    fn api_key(&self) -> &Self::ApiKey {
        &self.key
    }
    fn body(&self) -> &Self::Body {
        &()
    }

    // Override POST to send multipart/form-data

    fn post(
        &self,
    ) -> impl std::future::Future<Output = crate::ZaiResult<reqwest::Response>> + Send {
        let url: String = "https://open.bigmodel.cn/api/paas/v4/files".to_string();

        let key: String = self.key.clone();

        let purpose = self.purpose.clone();
        let path = self.file_path.clone();
        let file_name = self.file_name.clone();
        let content_type = self.content_type.clone();
        async move {
            let mut form =
                reqwest::multipart::Form::new().text("purpose", purpose.as_str().to_string());

            let fname = file_name
                .or_else(|| {
                    path.file_name()
                        .and_then(|s| s.to_str())
                        .map(|s| s.to_string())
                })
                .unwrap_or_else(|| "upload.bin".to_string());

            let mut part = reqwest::multipart::Part::bytes(std::fs::read(&path)?).file_name(fname);
            if let Some(ct) = content_type {
                part =
                    part.mime_str(&ct)
                        .map_err(|e| crate::client::error::ZaiError::ApiError {
                            code: 1200,
                            message: format!("invalid content-type: {}", e),
                        })?;
            }
            form = form.part("file", part);

            let resp = reqwest::Client::new()
                .post(url)
                .bearer_auth(key)
                .multipart(form)
                .send()
                .await?;

            let status = resp.status();
            if status.is_success() {
                return Ok(resp);
            }

            // Parse standard error envelope {"error": { code, message }}
            let text = resp.text().await.unwrap_or_default();
            #[derive(serde::Deserialize)]
            struct ErrEnv {
                error: ErrObj,
            }
            #[derive(serde::Deserialize)]
            struct ErrObj {
                _code: serde_json::Value,
                message: String,
            }

            if let Ok(parsed) = serde_json::from_str::<ErrEnv>(&text) {
                Err(crate::client::error::ZaiError::from_api_response(
                    status.as_u16(),
                    0,
                    parsed.error.message,
                ))
            } else {
                Err(crate::client::error::ZaiError::from_api_response(
                    status.as_u16(),
                    0,
                    text,
                ))
            }
        }
    }
}