mirror of
https://github.com/lightninglabs/loop
synced 2024-11-04 06:00:21 +00:00
110 lines
3.9 KiB
Go
110 lines
3.9 KiB
Go
package loop
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// Copyright (c) 2013-2017 The btcsuite developers
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// Copyright (c) 2015-2016 The Decred developers
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// Heavily inspired by https://github.com/btcsuite/btcd/blob/master/version.go
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// Copyright (C) 2015-2020 The Lightning Network Developers
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import (
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"bytes"
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"fmt"
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"math"
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"strings"
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)
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// Commit stores the current commit hash of this build, this should be set
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// using the -ldflags during compilation.
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var Commit string
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// semanticAlphabet is the allowed characters from the semantic versioning
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// guidelines for pre-release version and build metadata strings. In particular
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// they MUST only contain characters in semanticAlphabet.
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const semanticAlphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-"
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// These constants define the application version and follow the semantic
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// versioning 2.0.0 spec (http://semver.org/).
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const (
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// Note: please update release_notes.md when you change these values.
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appMajor uint = 0
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appMinor uint = 19
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appPatch uint = 1
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// appPreRelease MUST only contain characters from semanticAlphabet per
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// the semantic versioning spec.
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appPreRelease = "beta"
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// defaultAgentName is the default name of the software that is added as
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// the first part of the user agent string.
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defaultAgentName = "loopd"
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)
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// AgentName stores the name of the software that is added as the first part of
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// the user agent string. This defaults to the value "loopd" when being run as
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// a standalone component but can be overwritten by LiT for example when loopd
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// is integrated into the UI.
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var AgentName = defaultAgentName
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// Version returns the application version as a properly formed string per the
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// semantic versioning 2.0.0 spec (http://semver.org/) and the commit it was
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// built on.
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func Version() string {
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// Append commit hash of current build to version.
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return fmt.Sprintf("%s commit=%s", semanticVersion(), Commit)
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}
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// UserAgent returns the full user agent string that identifies the software
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// that is submitting swaps to the loop server.
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func UserAgent(initiator string) string {
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// We'll only allow "safe" characters in the initiator portion of the
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// user agent string and spaces only if surrounded by other characters.
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initiatorAlphabet := semanticAlphabet + ". "
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cleanInitiator := normalizeVerString(
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strings.TrimSpace(initiator), initiatorAlphabet,
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)
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if len(cleanInitiator) > 0 {
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cleanInitiator = fmt.Sprintf(",initiator=%s", cleanInitiator)
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}
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// The whole user agent string is limited to 255 characters server side
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// and also consists of the agent name, version and commit. So we only
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// want to take up at most 150 characters for the initiator. Anything
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// more will just be dropped.
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strLen := len(cleanInitiator)
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cleanInitiator = cleanInitiator[:int(math.Min(float64(strLen), 150))]
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// Assemble full string, including the commit hash of current build.
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return fmt.Sprintf(
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"%s/v%s/commit=%s%s", AgentName, semanticVersion(), Commit,
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cleanInitiator,
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)
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}
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// semanticVersion returns the SemVer part of the version.
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func semanticVersion() string {
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// Start with the major, minor, and patch versions.
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version := fmt.Sprintf("%d.%d.%d", appMajor, appMinor, appPatch)
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// Append pre-release version if there is one. The hyphen called for
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// by the semantic versioning spec is automatically appended and should
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// not be contained in the pre-release string. The pre-release version
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// is not appended if it contains invalid characters.
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preRelease := normalizeVerString(appPreRelease, semanticAlphabet)
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if preRelease != "" {
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version = fmt.Sprintf("%s-%s", version, preRelease)
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}
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return version
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}
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// normalizeVerString returns the passed string stripped of all characters
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// which are not valid according to the given alphabet.
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func normalizeVerString(str, alphabet string) string {
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var result bytes.Buffer
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for _, r := range str {
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if strings.ContainsRune(alphabet, r) {
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result.WriteRune(r)
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}
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}
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return result.String()
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}
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