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gemini_ex

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Comprehensive Elixir client for Google's Gemini AI API with dual authentication, embeddings with MRL, streaming, type safety, and built-in telemetry for production applications.

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gemini_ex lib gemini auth gemini_strategy.ex
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lib/gemini/auth/gemini_strategy.ex 

defmodule Gemini.Auth.GeminiStrategy do

  @moduledoc """

  Authentication strategy for Google Gemini API using API key.



  This strategy uses the simple x-goog-api-key header authentication

  method used by the Gemini API.

  """



  @behaviour Gemini.Auth.Strategy



  @base_url "https://generativelanguage.googleapis.com/v1beta"



  @impl true

  def headers(%{api_key: api_key}) when is_binary(api_key) and api_key != "" do

    {:ok,

     [

       {"Content-Type", "application/json"},

       {"x-goog-api-key", api_key}

     ]}

  end



  def headers(%{api_key: nil}) do

    {:error, "API key is nil"}

  end



  def headers(%{api_key: ""}) do

    {:error, "API key is empty"}

  end



  def headers(_credentials) do

    {:error, "API key is missing or invalid"}

  end



  @impl true

  def base_url(_credentials) do

    @base_url

  end



  @impl true

  def build_path(model, endpoint, _credentials) do

    # Normalize model name - add "models/" prefix if not present

    normalized_model =

      if String.starts_with?(model, "models/"), do: model, else: "models/#{model}"



    "#{normalized_model}:#{endpoint}"

  end



  @impl true

  def refresh_credentials(credentials) do

    # API keys don't need refreshing

    {:ok, credentials}

  end

end