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backend/internal/interfaces/api_handler.go

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+// Package interfaces defines the core interfaces and shared structures for the CLI Proxy API server.
+// These interfaces provide a common contract for different components of the application,
+// such as AI service clients, API handlers, and data models.
+package interfaces
+
+// APIHandler defines the interface that all API handlers must implement.
+// This interface provides methods for identifying handler types and retrieving
+// supported models for different AI service endpoints.
+type APIHandler interface {
+	// HandlerType returns the type identifier for this API handler.
+	// This is used to determine which request/response translators to use.
+	HandlerType() string
+
+	// Models returns a list of supported models for this API handler.
+	// Each model is represented as a map containing model metadata.
+	Models() []map[string]any
+}

backend/internal/interfaces/client_models.go

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+// Package interfaces defines the core interfaces and shared structures for the CLI Proxy API server.
+// These interfaces provide a common contract for different components of the application,
+// such as AI service clients, API handlers, and data models.
+package interfaces
+
+// Content represents a single message in a conversation, with a role and parts.
+// This structure models a message exchange between a user and an AI model.
+type Content struct {
+	// Role indicates who sent the message ("user", "model", or "tool").
+	Role string `json:"role"`
+
+	// Parts is a collection of content parts that make up the message.
+	Parts []Part `json:"parts"`
+}
+
+// Part represents a distinct piece of content within a message.
+// A part can be text, inline data (like an image), a function call, or a function response.
+type Part struct {
+	Thought bool `json:"thought,omitempty"`
+
+	// Text contains plain text content.
+	Text string `json:"text,omitempty"`
+
+	// InlineData contains base64-encoded data with its MIME type (e.g., images).
+	InlineData *InlineData `json:"inlineData,omitempty"`
+
+	// ThoughtSignature is a provider-required signature that accompanies certain parts.
+	ThoughtSignature string `json:"thoughtSignature,omitempty"`
+
+	// FunctionCall represents a tool call requested by the model.
+	FunctionCall *FunctionCall `json:"functionCall,omitempty"`
+
+	// FunctionResponse represents the result of a tool execution.
+	FunctionResponse *FunctionResponse `json:"functionResponse,omitempty"`
+}
+
+// InlineData represents base64-encoded data with its MIME type.
+// This is typically used for embedding images or other binary data in requests.
+type InlineData struct {
+	// MimeType specifies the media type of the embedded data (e.g., "image/png").
+	MimeType string `json:"mime_type,omitempty"`
+
+	// Data contains the base64-encoded binary data.
+	Data string `json:"data,omitempty"`
+}
+
+// FunctionCall represents a tool call requested by the model.
+// It includes the function name and its arguments that the model wants to execute.
+type FunctionCall struct {
+	// ID is the identifier of the function to be called.
+	ID string `json:"id,omitempty"`
+
+	// Name is the identifier of the function to be called.
+	Name string `json:"name"`
+
+	// Args contains the arguments to pass to the function.
+	Args map[string]interface{} `json:"args"`
+}
+
+// FunctionResponse represents the result of a tool execution.
+// This is sent back to the model after a tool call has been processed.
+type FunctionResponse struct {
+	// ID is the identifier of the function to be called.
+	ID string `json:"id,omitempty"`
+
+	// Name is the identifier of the function that was called.
+	Name string `json:"name"`
+
+	// Response contains the result data from the function execution.
+	Response map[string]interface{} `json:"response"`
+}
+
+// GenerateContentRequest is the top-level request structure for the streamGenerateContent endpoint.
+// This structure defines all the parameters needed for generating content from an AI model.
+type GenerateContentRequest struct {
+	// SystemInstruction provides system-level instructions that guide the model's behavior.
+	SystemInstruction *Content `json:"systemInstruction,omitempty"`
+
+	// Contents is the conversation history between the user and the model.
+	Contents []Content `json:"contents"`
+
+	// Tools defines the available tools/functions that the model can call.
+	Tools []ToolDeclaration `json:"tools,omitempty"`
+
+	// GenerationConfig contains parameters that control the model's generation behavior.
+	GenerationConfig `json:"generationConfig"`
+}
+
+// GenerationConfig defines parameters that control the model's generation behavior.
+// These parameters affect the creativity, randomness, and reasoning of the model's responses.
+type GenerationConfig struct {
+	// ThinkingConfig specifies configuration for the model's "thinking" process.
+	ThinkingConfig GenerationConfigThinkingConfig `json:"thinkingConfig,omitempty"`
+
+	// Temperature controls the randomness of the model's responses.
+	// Values closer to 0 make responses more deterministic, while values closer to 1 increase randomness.
+	Temperature float64 `json:"temperature,omitempty"`
+
+	// TopP controls nucleus sampling, which affects the diversity of responses.
+	// It limits the model to consider only the top P% of probability mass.
+	TopP float64 `json:"topP,omitempty"`
+
+	// TopK limits the model to consider only the top K most likely tokens.
+	// This can help control the quality and diversity of generated text.
+	TopK float64 `json:"topK,omitempty"`
+}
+
+// GenerationConfigThinkingConfig specifies configuration for the model's "thinking" process.
+// This controls whether the model should output its reasoning process along with the final answer.
+type GenerationConfigThinkingConfig struct {
+	// IncludeThoughts determines whether the model should output its reasoning process.
+	// When enabled, the model will include its step-by-step thinking in the response.
+	IncludeThoughts bool `json:"include_thoughts,omitempty"`
+}
+
+// ToolDeclaration defines the structure for declaring tools (like functions)
+// that the model can call during content generation.
+type ToolDeclaration struct {
+	// FunctionDeclarations is a list of available functions that the model can call.
+	FunctionDeclarations []interface{} `json:"functionDeclarations"`
+}

backend/internal/interfaces/error_message.go

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+// Package interfaces defines the core interfaces and shared structures for the CLI Proxy API server.
+// These interfaces provide a common contract for different components of the application,
+// such as AI service clients, API handlers, and data models.
+package interfaces
+
+import "net/http"
+
+// ErrorMessage encapsulates an error with an associated HTTP status code.
+// This structure is used to provide detailed error information including
+// both the HTTP status and the underlying error.
+type ErrorMessage struct {
+	// StatusCode is the HTTP status code returned by the API.
+	StatusCode int
+
+	// Error is the underlying error that occurred.
+	Error error
+
+	// Addon contains upstream headers that may be passed through when enabled.
+	Addon http.Header
+
+	// DirectResponse reports that Body and Headers were explicitly supplied by a trusted in-process component.
+	DirectResponse bool
+
+	// Body contains a preformatted downstream response when DirectResponse is true.
+	Body []byte
+
+	// Headers contains downstream response headers when DirectResponse is true.
+	Headers http.Header
+}

backend/internal/interfaces/types.go

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+// Package interfaces provides type aliases for backwards compatibility with translator functions.
+// It defines common interface types used throughout the CLI Proxy API for request and response
+// transformation operations, maintaining compatibility with the SDK translator package.
+package interfaces
+
+import sdktranslator "github.com/router-for-me/CLIProxyAPI/v7/sdk/translator"
+
+// Backwards compatible aliases for translator function types.
+type TranslateRequestFunc = sdktranslator.RequestTransform
+
+type TranslateResponseFunc = sdktranslator.ResponseStreamTransform
+
+type TranslateResponseNonStreamFunc = sdktranslator.ResponseNonStreamTransform
+
+type TranslateResponse = sdktranslator.ResponseTransform