horizoncd/horizon

// Copyright © 2023 Horizoncd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
package common
 
import (
    "context"
    "strings"
 
    "github.com/gin-gonic/gin"
 
    herror "github.com/horizoncd/horizon/core/errors"
    "github.com/horizoncd/horizon/pkg/authentication/user"
    perror "github.com/horizoncd/horizon/pkg/errors"
)
 
const (
    UserQueryName = "filter"
    UserQueryType = "userType"
    UserQueryID   = "id"
)
 
const (
    contextUserKey = "contextUser"
 
    AuthorizationHeaderKey = "Authorization"
    TokenHeaderValuePrefix = "Bearer"
)
 
func UserContextKey() string {
    return contextUserKey
}
 
func UserFromContext(ctx context.Context) (user.User, error) {
    u, ok := ctx.Value(contextUserKey).(user.User)
    if !ok {
        return nil, herror.ErrFailedToGetUser
    }
    return u, nil
}
 
func WithContext(parent context.Context, user user.User) context.Context {
    return context.WithValue(parent, UserContextKey(), user) // nolint
}
 
func SetUser(c *gin.Context, user user.User) {
    // attach user to context
    c.Set(contextUserKey, user)
}
 
func GetToken(c *gin.Context) (string, error) {
    if _, ok := c.Request.Header[AuthorizationHeaderKey]; !ok {
        return "", perror.Wrap(herror.ErrAuthorizationHeaderNotFound, "")
    }
    token, err := func() (string, error) {
        parts := strings.Split(c.Request.Header.Get(AuthorizationHeaderKey), " ")
        if len(parts) != 2 || parts[0] != TokenHeaderValuePrefix {
            return "", perror.Wrapf(herror.ErrOAuthTokenFormatError, "header = %s",
                c.Request.Header.Get(AuthorizationHeaderKey))
        }
        return parts[1], nil
    }()
    return token, err
}