94 lines
2.6 KiB
Go
94 lines
2.6 KiB
Go
/*
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Copyright 2023 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"encoding/json"
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"errors"
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"net/netip"
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"sort"
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)
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// parseGCP parses raw GCP cloud.json data
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// and processes it to a regionsToPrefixes map
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func parseGCP(raw string) (regionsToPrefixes, error) {
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parsed, err := parseGCPCloudJSON([]byte(raw))
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if err != nil {
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return nil, err
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}
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return gcpRegionsToPrefixesFromData(parsed)
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}
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type GCPCloudJSON struct {
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Prefixes []GCPPrefix `json:"prefixes"`
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// syncToken and createDate omitted
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}
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type GCPPrefix struct {
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IPv4Prefix string `json:"ipv4Prefix"`
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IPv6Prefix string `json:"ipv6Prefix"`
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Scope string `json:"scope"`
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// service omitted
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}
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// parseGCPCloudJSON parses GCP cloud.json IP ranges JSON data
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func parseGCPCloudJSON(rawJSON []byte) (*GCPCloudJSON, error) {
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r := &GCPCloudJSON{}
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if err := json.Unmarshal(rawJSON, r); err != nil {
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return nil, err
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}
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return r, nil
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}
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// gcpRegionsToPrefixesFromData processes the raw unmarshalled JSON into regionsToPrefixes map
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func gcpRegionsToPrefixesFromData(data *GCPCloudJSON) (regionsToPrefixes, error) {
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// convert from AWS published structure to a map by region, parse Prefixes
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rtp := regionsToPrefixes{}
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for _, prefix := range data.Prefixes {
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region := prefix.Scope
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if prefix.IPv4Prefix != "" {
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ipPrefix, err := netip.ParsePrefix(prefix.IPv4Prefix)
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if err != nil {
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return nil, err
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}
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rtp[region] = append(rtp[region], ipPrefix)
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} else if prefix.IPv6Prefix != "" {
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ipPrefix, err := netip.ParsePrefix(prefix.IPv6Prefix)
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if err != nil {
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return nil, err
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}
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rtp[region] = append(rtp[region], ipPrefix)
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} else {
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return nil, errors.New("unexpected entry with no ipv4Prefix or ipv6Prefix")
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}
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}
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// flatten
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numPrefixes := 0
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for region := range rtp {
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// this approach allows us to produce consistent generated results
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// since the ip ranges will be ordered
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sort.Slice(rtp[region], func(i, j int) bool {
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return rtp[region][i].String() < rtp[region][j].String()
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})
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rtp[region] = dedupeSortedPrefixes(rtp[region])
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numPrefixes += len(rtp[region])
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}
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return rtp, nil
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}
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