codexia 0.2.1

OpenAI- and Anthropic-compatible local API gateway backed by Codex OAuth.
Documentation 
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use serde::{Deserialize, Serialize};
use serde_json::{Map, Value};

#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
pub struct ChatCompletionRequest {
    pub model: String,
    #[serde(default)]
    pub messages: Vec<ChatMessage>,
    #[serde(default)]
    pub stream: Option<bool>,
    #[serde(default)]
    pub temperature: Option<f64>,
    #[serde(default)]
    pub tools: Option<Vec<ChatTool>>,
    #[serde(default)]
    pub tool_choice: Option<Value>,
    #[serde(default)]
    pub service_tier: Option<String>,
    #[serde(default)]
    pub reasoning_effort: Option<String>,
    #[serde(default)]
    pub max_completion_tokens: Option<u32>,
    #[serde(default)]
    pub max_tokens: Option<u32>,
    #[serde(flatten)]
    pub extra: Map<String, Value>,
}

impl ChatCompletionRequest {
    pub fn wants_stream(&self) -> bool {
        self.stream.unwrap_or(false)
    }
}

#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
pub struct ChatMessage {
    pub role: String,
    #[serde(default)]
    pub content: Option<ChatContent>,
    #[serde(default)]
    pub name: Option<String>,
    #[serde(default)]
    pub tool_call_id: Option<String>,
    #[serde(default)]
    pub tool_calls: Option<Vec<ToolCall>>,
}

#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
#[serde(untagged)]
pub enum ChatContent {
    Text(String),
    Parts(Vec<ChatContentPart>),
}

#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
pub struct ChatContentPart {
    #[serde(rename = "type")]
    pub kind: String,
    #[serde(default)]
    pub text: Option<String>,
    #[serde(default)]
    pub image_url: Option<ImageUrl>,
}

#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
pub struct ImageUrl {
    pub url: String,
    #[serde(default)]
    pub detail: Option<String>,
}

#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
pub struct ToolCall {
    pub id: String,
    #[serde(rename = "type")]
    pub kind: String,
    pub function: FunctionCall,
}

#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
pub struct FunctionCall {
    pub name: String,
    pub arguments: String,
}

#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
pub struct ChatTool {
    #[serde(rename = "type")]
    pub kind: String,
    pub function: FunctionTool,
}

#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
pub struct FunctionTool {
    pub name: String,
    #[serde(default)]
    pub description: Option<String>,
    #[serde(default)]
    pub parameters: Option<Value>,
    #[serde(default)]
    pub strict: Option<bool>,
}

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

    #[test]
    fn parses_standard_string_message() {
        let request: ChatCompletionRequest = serde_json::from_value(serde_json::json!({
            "model": "gpt-5.4",
            "messages": [{"role": "user", "content": "hello"}]
        }))
        .unwrap();

        assert!(!request.wants_stream());
        assert_eq!(
            request.messages[0].content,
            Some(ChatContent::Text("hello".into()))
        );
    }

    #[test]
    fn parses_multimodal_content_parts() {
        let message: ChatMessage = serde_json::from_value(serde_json::json!({
            "role": "user",
            "content": [
                {"type": "text", "text": "look"},
                {"type": "image_url", "image_url": {"url": "data:image/png;base64,abc"}}
            ]
        }))
        .unwrap();

        let parts = match message.content.unwrap() {
            ChatContent::Parts(parts) => parts,
            ChatContent::Text(_) => panic!("expected parts"),
        };
        assert_eq!(parts.len(), 2);
        assert_eq!(
            parts[1].image_url.as_ref().unwrap().url,
            "data:image/png;base64,abc"
        );
    }
}