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Extract the evaluator type and create Gitpod and Replicated licensors
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Simon Emms
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Feb 21, 2022
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| // Copyright (c) 2022 Gitpod GmbH. All rights reserved. | ||
| // Licensed under the Gitpod Enterprise Source Code License, | ||
| // See License.enterprise.txt in the project root folder. | ||
|
|
||
| package licensor | ||
|
|
||
| import ( | ||
| "crypto" | ||
| "crypto/rsa" | ||
| "crypto/sha256" | ||
| "encoding/base64" | ||
| "encoding/json" | ||
| "fmt" | ||
| "time" | ||
| ) | ||
|
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||
| // GitpodEvaluator determines what a license allows for | ||
| type GitpodEvaluator struct { | ||
| invalid string | ||
| lic LicensePayload | ||
| } | ||
|
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| // Validate returns false if the license isn't valid and a message explaining why that is. | ||
| func (e *GitpodEvaluator) Validate() (msg string, valid bool) { | ||
| if e.invalid == "" { | ||
| return "", true | ||
| } | ||
|
|
||
| return e.invalid, false | ||
| } | ||
|
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| // Enabled determines if a feature is enabled by the license | ||
| func (e *GitpodEvaluator) Enabled(feature Feature) bool { | ||
| if e.invalid != "" { | ||
| return false | ||
| } | ||
|
|
||
| _, ok := e.lic.Level.allowance().Features[feature] | ||
| return ok | ||
| } | ||
|
|
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| // HasEnoughSeats returns true if the license supports at least the give amount of seats | ||
| func (e *GitpodEvaluator) HasEnoughSeats(seats int) bool { | ||
| if e.invalid != "" { | ||
| return false | ||
| } | ||
|
|
||
| return e.lic.Seats == 0 || seats <= e.lic.Seats | ||
| } | ||
|
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| // Inspect returns the license information this evaluator holds. | ||
| // This function is intended for transparency/debugging purposes only and must | ||
| // never be used to determine feature eligibility under a license. All code making | ||
| // those kinds of decisions must be part of the Evaluator. | ||
| func (e *GitpodEvaluator) Inspect() LicensePayload { | ||
| return e.lic | ||
| } | ||
|
|
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| // NewGitpodEvaluator produces a new license evaluator from a license key | ||
| func NewGitpodEvaluator(key []byte, domain string) (res *GitpodEvaluator) { | ||
| if len(key) == 0 { | ||
| // fallback to the default license | ||
| return &GitpodEvaluator{ | ||
| lic: defaultLicense, | ||
| } | ||
| } | ||
|
|
||
| deckey := make([]byte, base64.StdEncoding.DecodedLen(len(key))) | ||
| n, err := base64.StdEncoding.Decode(deckey, key) | ||
| if err != nil { | ||
| return &GitpodEvaluator{invalid: fmt.Sprintf("cannot decode key: %q", err)} | ||
| } | ||
| deckey = deckey[:n] | ||
|
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| var lic licensePayload | ||
| err = json.Unmarshal(deckey, &lic) | ||
| if err != nil { | ||
| return &GitpodEvaluator{invalid: fmt.Sprintf("cannot unmarshal key: %q", err)} | ||
| } | ||
|
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| keyWoSig, err := json.Marshal(lic.LicensePayload) | ||
| if err != nil { | ||
| return &GitpodEvaluator{invalid: fmt.Sprintf("cannot remarshal key: %q", err)} | ||
| } | ||
| hashed := sha256.Sum256(keyWoSig) | ||
|
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| for _, k := range publicKeys { | ||
| err = rsa.VerifyPKCS1v15(k, crypto.SHA256, hashed[:], lic.Signature) | ||
| if err == nil { | ||
| break | ||
| } | ||
| } | ||
| if err != nil { | ||
| return &GitpodEvaluator{invalid: fmt.Sprintf("cannot verify key: %q", err)} | ||
| } | ||
|
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| if !matchesDomain(lic.Domain, domain) { | ||
| return &GitpodEvaluator{invalid: "wrong domain"} | ||
| } | ||
|
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| if lic.ValidUntil.Before(time.Now()) { | ||
| return &GitpodEvaluator{invalid: "not valid anymore"} | ||
| } | ||
|
|
||
| return &GitpodEvaluator{ | ||
| lic: lic.LicensePayload, | ||
| } | ||
| } |
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