package addrs import ( "fmt" "strings" "golang.org/x/net/idna" "github.com/hashicorp/hcl/v2" svchost "github.com/hashicorp/terraform-svchost" "github.com/hashicorp/terraform/tfdiags" ) // Provider encapsulates a single provider type. In the future this will be // extended to include additional fields including Namespace and SourceHost type Provider struct { Type string Namespace string Hostname svchost.Hostname } // DefaultRegistryHost is the hostname used for provider addresses that do // not have an explicit hostname. const DefaultRegistryHost = svchost.Hostname("registry.terraform.io") // LegacyProviderNamespace is the special string used in the Namespace field // of type Provider to mark a legacy provider address. This special namespace // value would normally be invalid, and can be used only when the hostname is // DefaultRegistryHost because that host owns the mapping from legacy name to // FQN. const LegacyProviderNamespace = "-" // String returns an FQN string, indended for use in output. func (pt Provider) String() string { if pt.IsZero() { panic("called String on zero-value addrs.Provider") } return pt.Hostname.ForDisplay() + "/" + pt.Namespace + "/" + pt.Type } // NewProvider constructs a provider address from its parts, and normalizes // the namespace and type parts to lowercase using unicode case folding rules // so that resulting addrs.Provider values can be compared using standard // Go equality rules (==). // // The hostname is given as a svchost.Hostname, which is required by the // contract of that type to have already been normalized for equality testing. // // This function will panic if the given namespace or type name are not valid. // When accepting namespace or type values from outside the program, use // ParseProviderPart first to check that the given value is valid. func NewProvider(hostname svchost.Hostname, namespace, typeName string) Provider { if namespace == LegacyProviderNamespace { // Legacy provider addresses must always be created via // NewLegacyProvider so that we can use static analysis to find // codepaths still working with those. panic("attempt to create legacy provider address using NewProvider; use NewLegacyProvider instead") } return Provider{ Type: MustParseProviderPart(typeName), Namespace: MustParseProviderPart(namespace), Hostname: hostname, } } // NewDefaultProvider returns the default address of a HashiCorp-maintained, // Registry-hosted provider. func NewDefaultProvider(name string) Provider { return Provider{ Type: MustParseProviderPart(name), Namespace: "hashicorp", Hostname: DefaultRegistryHost, } } // NewLegacyProvider returns a mock address for a provider. // This will be removed when ProviderType is fully integrated. func NewLegacyProvider(name string) Provider { return Provider{ // We intentionally don't normalize and validate the legacy names, // because existing code expects legacy provider names to pass through // verbatim, even if not compliant with our new naming rules. Type: name, Namespace: LegacyProviderNamespace, Hostname: DefaultRegistryHost, } } // LegacyString returns the provider type, which is frequently used // interchangeably with provider name. This function can and should be removed // when provider type is fully integrated. As a safeguard for future // refactoring, this function panics if the Provider is not a legacy provider. func (pt Provider) LegacyString() string { if pt.IsZero() { panic("called LegacyString on zero-value addrs.Provider") } if pt.Namespace != LegacyProviderNamespace { panic(pt.String() + " is not a legacy addrs.Provider") } return pt.Type } // IsZero returns true if the receiver is the zero value of addrs.Provider. // // The zero value is not a valid addrs.Provider and calling other methods on // such a value is likely to either panic or otherwise misbehave. func (pt Provider) IsZero() bool { return pt == Provider{} } // LessThan returns true if the receiver should sort before the other given // address in an ordered list of provider addresses. // // This ordering is an arbitrary one just to allow deterministic results from // functions that would otherwise have no natural ordering. It's subject // to change in future. func (pt Provider) LessThan(other Provider) bool { switch { case pt.Hostname != other.Hostname: return pt.Hostname < other.Hostname case pt.Namespace != other.Namespace: return pt.Namespace < other.Namespace default: return pt.Type < other.Type } } // IsLegacy returns true if the provider is a legacy-style provider func (pt Provider) IsLegacy() bool { if pt.IsZero() { panic("called IsLegacy() on zero-value addrs.Provider") } return pt.Hostname == DefaultRegistryHost && pt.Namespace == LegacyProviderNamespace } // IsDefault returns true if the provider is a default hashicorp provider func (pt Provider) IsDefault() bool { if pt.IsZero() { panic("called IsDefault() on zero-value addrs.Provider") } return pt.Hostname == DefaultRegistryHost && pt.Namespace == "hashicorp" } // Equals returns true if the receiver and other provider have the same attributes. func (pt Provider) Equals(other Provider) bool { return pt == other } // ParseProviderSourceString parses the source attribute and returns a provider. // This is intended primarily to parse the FQN-like strings returned by // terraform-config-inspect. // // The following are valid source string formats: // name // namespace/name // hostname/namespace/name func ParseProviderSourceString(str string) (Provider, tfdiags.Diagnostics) { var ret Provider var diags tfdiags.Diagnostics // split the source string into individual components parts := strings.Split(str, "/") if len(parts) == 0 || len(parts) > 3 { diags = diags.Append(&hcl.Diagnostic{ Severity: hcl.DiagError, Summary: "Invalid provider source string", Detail: `The "source" attribute must be in the format "[hostname/][namespace/]name"`, }) return ret, diags } // check for an invalid empty string in any part for i := range parts { if parts[i] == "" { diags = diags.Append(&hcl.Diagnostic{ Severity: hcl.DiagError, Summary: "Invalid provider source string", Detail: `The "source" attribute must be in the format "[hostname/][namespace/]name"`, }) return ret, diags } } // check the 'name' portion, which is always the last part givenName := parts[len(parts)-1] name, err := ParseProviderPart(givenName) if err != nil { diags = diags.Append(&hcl.Diagnostic{ Severity: hcl.DiagError, Summary: "Invalid provider type", Detail: fmt.Sprintf(`Invalid provider type %q in source %q: %s"`, givenName, str, err), }) return ret, diags } ret.Type = name ret.Hostname = DefaultRegistryHost if len(parts) == 1 { // FIXME: update this to NewDefaultProvider in the provider source release return NewLegacyProvider(parts[0]), diags } if len(parts) >= 2 { // the namespace is always the second-to-last part givenNamespace := parts[len(parts)-2] if givenNamespace == LegacyProviderNamespace { // For now we're tolerating legacy provider addresses until we've // finished updating the rest of the codebase to no longer use them, // or else we'd get errors round-tripping through legacy subsystems. ret.Namespace = LegacyProviderNamespace } else { namespace, err := ParseProviderPart(givenNamespace) if err != nil { diags = diags.Append(&hcl.Diagnostic{ Severity: hcl.DiagError, Summary: "Invalid provider namespace", Detail: fmt.Sprintf(`Invalid provider namespace %q in source %q: %s"`, namespace, str, err), }) return Provider{}, diags } ret.Namespace = namespace } } // Final Case: 3 parts if len(parts) == 3 { // the namespace is always the first part in a three-part source string hn, err := svchost.ForComparison(parts[0]) if err != nil { diags = diags.Append(&hcl.Diagnostic{ Severity: hcl.DiagError, Summary: "Invalid provider source hostname", Detail: fmt.Sprintf(`Invalid provider source hostname namespace %q in source %q: %s"`, hn, str, err), }) return Provider{}, diags } ret.Hostname = hn } if ret.Namespace == LegacyProviderNamespace && ret.Hostname != DefaultRegistryHost { // Legacy provider addresses must always be on the default registry // host, because the default registry host decides what actual FQN // each one maps to. diags = diags.Append(&hcl.Diagnostic{ Severity: hcl.DiagError, Summary: "Invalid provider namespace", Detail: "The legacy provider namespace \"-\" can be used only with hostname " + DefaultRegistryHost.ForDisplay() + ".", }) return Provider{}, diags } return ret, diags } // ParseProviderPart processes an addrs.Provider namespace or type string // provided by an end-user, producing a normalized version if possible or // an error if the string contains invalid characters. // // A provider part is processed in the same way as an individual label in a DNS // domain name: it is transformed to lowercase per the usual DNS case mapping // and normalization rules and may contain only letters, digits, and dashes. // Additionally, dashes may not appear at the start or end of the string. // // These restrictions are intended to allow these names to appear in fussy // contexts such as directory/file names on case-insensitive filesystems, // repository names on GitHub, etc. We're using the DNS rules in particular, // rather than some similar rules defined locally, because the hostname part // of an addrs.Provider is already a hostname and it's ideal to use exactly // the same case folding and normalization rules for all of the parts. // // In practice a provider type string conventionally does not contain dashes // either. Such names are permitted, but providers with such type names will be // hard to use because their resource type names will not be able to contain // the provider type name and thus each resource will need an explicit provider // address specified. (A real-world example of such a provider is the // "google-beta" variant of the GCP provider, which has resource types that // start with the "google_" prefix instead.) // // It's valid to pass the result of this function as the argument to a // subsequent call, in which case the result will be identical. func ParseProviderPart(given string) (string, error) { if len(given) == 0 { return "", fmt.Errorf("must have at least one character") } // We're going to process the given name using the same "IDNA" library we // use for the hostname portion, since it already implements the case // folding rules we want. // // The idna library doesn't expose individual label parsing directly, but // once we've verified it doesn't contain any dots we can just treat it // like a top-level domain for this library's purposes. if strings.ContainsRune(given, '.') { return "", fmt.Errorf("dots are not allowed") } // We don't allow names containing multiple consecutive dashes, just as // a matter of preference: they look weird, confusing, or incorrect. // This also, as a side-effect, prevents the use of the "punycode" // indicator prefix "xn--" that would cause the IDNA library to interpret // the given name as punycode, because that would be weird and unexpected. if strings.Contains(given, "--") { return "", fmt.Errorf("cannot use multiple consecutive dashes") } result, err := idna.Lookup.ToUnicode(given) if err != nil { return "", fmt.Errorf("must contain only letters, digits, and dashes, and may not use leading or trailing dashes") } return result, nil } // MustParseProviderPart is a wrapper around ParseProviderPart that panics if // it returns an error. func MustParseProviderPart(given string) string { result, err := ParseProviderPart(given) if err != nil { panic(err.Error()) } return result }