email-api-client/client/client.go

package client

import (
	"context"
	"errors"
)

type Client struct {
	config *Configuration
	token  *Token
}

type contextKeyType string

var contextKey contextKeyType = "client"

type accessTokenRequest struct {
	GrantType    string `json:"grant_type"`
	ClientId     string `json:"client_id"`
	ClientSecret string `json:"client_secret"`
}

func NewClient(config *Configuration) (*Client, error) {

	client := &Client{
		config: config,
	}

	token, err := getToken(client.config)
	if err != nil {
		return nil, errors.New("failed to get token: " + err.Error())
	}

	client.token = token

	return client, nil
}

func FromContext(ctx context.Context) *Client {
	client := ctx.Value(contextKey)
	if client == nil {
		return nil
	}

	if c, ok := client.(*Client); ok {
		return c
	}

	return nil
}

func NewWithContext(ctx context.Context, config *Configuration) (context.Context, error) {
	client, err := NewClient(config)
	if err != nil {
		return nil, errors.New("failed to create client: " + err.Error())
	}

	ctx = context.WithValue(ctx, contextKey, client)
	if c, ok := ctx.Value(contextKey).(*Client); ok {
		return context.WithValue(ctx, contextKey, c), nil
	} else {
		return nil, errors.New("failed to set client in context")
	}
}