mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-06-02 21:39:25 +00:00
133 lines
3.4 KiB
Go
133 lines
3.4 KiB
Go
/*
|
|
*
|
|
* Copyright 2020 gRPC authors.
|
|
*
|
|
* 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 metadata contains functions to set and get metadata from addresses.
|
|
//
|
|
// This package is experimental.
|
|
package metadata
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
|
|
"google.golang.org/grpc/metadata"
|
|
"google.golang.org/grpc/resolver"
|
|
)
|
|
|
|
type mdKeyType string
|
|
|
|
const mdKey = mdKeyType("grpc.internal.address.metadata")
|
|
|
|
type mdValue metadata.MD
|
|
|
|
func (m mdValue) Equal(o any) bool {
|
|
om, ok := o.(mdValue)
|
|
if !ok {
|
|
return false
|
|
}
|
|
if len(m) != len(om) {
|
|
return false
|
|
}
|
|
for k, v := range m {
|
|
ov := om[k]
|
|
if len(ov) != len(v) {
|
|
return false
|
|
}
|
|
for i, ve := range v {
|
|
if ov[i] != ve {
|
|
return false
|
|
}
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// Get returns the metadata of addr.
|
|
func Get(addr resolver.Address) metadata.MD {
|
|
attrs := addr.Attributes
|
|
if attrs == nil {
|
|
return nil
|
|
}
|
|
md, _ := attrs.Value(mdKey).(mdValue)
|
|
return metadata.MD(md)
|
|
}
|
|
|
|
// Set sets (overrides) the metadata in addr.
|
|
//
|
|
// When a SubConn is created with this address, the RPCs sent on it will all
|
|
// have this metadata.
|
|
func Set(addr resolver.Address, md metadata.MD) resolver.Address {
|
|
addr.Attributes = addr.Attributes.WithValue(mdKey, mdValue(md))
|
|
return addr
|
|
}
|
|
|
|
// Validate validates every pair in md with ValidatePair.
|
|
func Validate(md metadata.MD) error {
|
|
for k, vals := range md {
|
|
if err := ValidatePair(k, vals...); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// hasNotPrintable return true if msg contains any characters which are not in %x20-%x7E
|
|
func hasNotPrintable(msg string) bool {
|
|
// for i that saving a conversion if not using for range
|
|
for i := 0; i < len(msg); i++ {
|
|
if msg[i] < 0x20 || msg[i] > 0x7E {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// ValidatePair validate a key-value pair with the following rules (the pseudo-header will be skipped) :
|
|
//
|
|
// - key must contain one or more characters.
|
|
// - the characters in the key must be contained in [0-9 a-z _ - .].
|
|
// - if the key ends with a "-bin" suffix, no validation of the corresponding value is performed.
|
|
// - the characters in the every value must be printable (in [%x20-%x7E]).
|
|
func ValidatePair(key string, vals ...string) error {
|
|
// key should not be empty
|
|
if key == "" {
|
|
return fmt.Errorf("there is an empty key in the header")
|
|
}
|
|
// pseudo-header will be ignored
|
|
if key[0] == ':' {
|
|
return nil
|
|
}
|
|
// check key, for i that saving a conversion if not using for range
|
|
for i := 0; i < len(key); i++ {
|
|
r := key[i]
|
|
if !(r >= 'a' && r <= 'z') && !(r >= '0' && r <= '9') && r != '.' && r != '-' && r != '_' {
|
|
return fmt.Errorf("header key %q contains illegal characters not in [0-9a-z-_.]", key)
|
|
}
|
|
}
|
|
if strings.HasSuffix(key, "-bin") {
|
|
return nil
|
|
}
|
|
// check value
|
|
for _, val := range vals {
|
|
if hasNotPrintable(val) {
|
|
return fmt.Errorf("header key %q contains value with non-printable ASCII characters", key)
|
|
}
|
|
}
|
|
return nil
|
|
}
|