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context.go
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/
context.go
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/*
* Copyright (c) 2019. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pydio Cells is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
// Package context manipulates context metadata
package context
import (
"context"
"net/http"
"strings"
"github.com/micro/go-micro/metadata"
"golang.org/x/net/http/httpguts"
"github.com/pydio/cells/common"
)
// MinioMetaFromContext prepares metadata for minio client, merging context medata
// and eventually the Context User Key value (X-Pydio-User). Used to prepare metadata
// sent by Minio Clients
func MinioMetaFromContext(ctx context.Context) (md map[string]string, ok bool) {
md = make(map[string]string)
if meta, mOk := metadata.FromContext(ctx); mOk {
for k, v := range meta {
if strings.ToLower(k) == "x-pydio-claims" {
continue
}
if httpguts.ValidHeaderFieldName(k) && httpguts.ValidHeaderFieldValue(v) {
md[k] = v
}
}
}
if user := ctx.Value(common.PydioContextUserKey); user != nil {
md[common.PydioContextUserKey] = user.(string)
}
return md, len(md) > 0
}
// AppendCellsMetaFromContext extract valid header names from context and push them
// to the request Headers
func AppendCellsMetaFromContext(ctx context.Context, req *http.Request) {
if meta, ok := MinioMetaFromContext(ctx); ok {
for k, v := range meta {
if strings.ToLower(k) == "authorization" {
continue
}
if httpguts.ValidHeaderFieldName(k) && httpguts.ValidHeaderFieldValue(v) {
req.Header.Set(k, v)
}
}
}
}
// WithUserNameMetadata appends a user name to both the context metadata and as context key.
func WithUserNameMetadata(ctx context.Context, userName string) context.Context {
md := make(map[string]string)
if meta, ok := metadata.FromContext(ctx); ok {
for k, v := range meta {
if strings.ToLower(k) == strings.ToLower(common.PydioContextUserKey) {
continue
}
md[k] = v
}
}
md[common.PydioContextUserKey] = userName
ctx = metadata.NewContext(ctx, md)
// Add it as value for easier use inside the gateway, but this will not be transmitted
ctx = context.WithValue(ctx, common.PydioContextUserKey, userName)
return ctx
}
// ContextMetadata wraps micro lib metadata.FromContext call
func ContextMetadata(ctx context.Context) (map[string]string, bool) {
return metadata.FromContext(ctx)
}
// WithMetadata wraps micro lib metadata.NewContext call
func WithMetadata(ctx context.Context, md map[string]string) context.Context {
return metadata.NewContext(ctx, md)
}
// CanonicalMeta extract header name or its lowercase version
func CanonicalMeta(ctx context.Context, name string) (string, bool) {
if md, o := ContextMetadata(ctx); o {
if val, ok := md[name]; ok {
return val, true
} else if val, ok := md[strings.ToLower(name)]; ok {
return val, true
}
}
return "", false
}
// WithAdditionalMetadata retrieves existing meta, adds new key/values to the map and produces a new context
// It enforces case-conflicts on all keys
func WithAdditionalMetadata(ctx context.Context, meta map[string]string) context.Context {
md := make(map[string]string)
if mm, ok := metadata.FromContext(ctx); ok {
for k, v := range mm {
ignore := false
for nk, _ := range meta {
if strings.ToLower(nk) == strings.ToLower(k) {
ignore = true
break
}
}
if ignore {
continue
}
md[k] = v
}
}
for k, v := range meta {
md[k] = v
}
return metadata.NewContext(ctx, md)
}
// WithMetaCopy makes sure the metadata map will is replicated and unique to this context
func WithMetaCopy(ctx context.Context) context.Context {
md := make(map[string]string)
if meta, ok := metadata.FromContext(ctx); ok {
for k, v := range meta {
md[k] = v
}
}
return metadata.NewContext(ctx, md)
}