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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package tfconfig
import (
"fmt"
"github.com/hashicorp/hcl/v2"
"github.com/hashicorp/hcl/v2/gohcl"
"github.com/zclconf/go-cty/cty"
)
// ProviderRef is a reference to a provider configuration within a module.
// It represents the contents of a "provider" argument in a resource, or
// a value in the "providers" map for a module call.
type ProviderRef struct {
Name string `json:"name"`
Alias string `json:"alias,omitempty"` // Empty if the default provider configuration is referenced
}
type ProviderRequirement struct {
Source string `json:"source,omitempty"`
VersionConstraints []string `json:"version_constraints,omitempty"`
ConfigurationAliases []ProviderRef `json:"aliases,omitempty"`
}
func decodeRequiredProvidersBlock(block *hcl.Block) (map[string]*ProviderRequirement, hcl.Diagnostics) {
attrs, diags := block.Body.JustAttributes()
reqs := make(map[string]*ProviderRequirement)
for name, attr := range attrs {
// Look for a legacy version in the attribute first
if expr, err := attr.Expr.Value(nil); err == nil && expr.Type().IsPrimitiveType() {
var version string
valDiags := gohcl.DecodeExpression(attr.Expr, nil, &version)
diags = append(diags, valDiags...)
if !valDiags.HasErrors() {
reqs[name] = &ProviderRequirement{
VersionConstraints: []string{version},
}
}
continue
}
kvs, mapDiags := hcl.ExprMap(attr.Expr)
if mapDiags.HasErrors() {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid required_providers object",
Detail: "Required providers entries must be strings or objects.",
Subject: attr.Expr.Range().Ptr(),
})
continue
}
var pr ProviderRequirement
for _, kv := range kvs {
key, keyDiags := kv.Key.Value(nil)
if keyDiags.HasErrors() {
diags = append(diags, keyDiags...)
continue
}
if key.Type() != cty.String {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid Attribute",
Detail: fmt.Sprintf("Invalid attribute value for provider requirement: %#v", key),
Subject: kv.Key.Range().Ptr(),
})
continue
}
switch key.AsString() {
case "version":
version, valDiags := kv.Value.Value(nil)
if valDiags.HasErrors() || !version.Type().Equals(cty.String) {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Unsuitable value type",
Detail: "Unsuitable value: string required",
Subject: attr.Expr.Range().Ptr(),
})
continue
}
if !version.IsNull() {
pr.VersionConstraints = append(pr.VersionConstraints, version.AsString())
}
case "source":
source, valDiags := kv.Value.Value(nil)
if valDiags.HasErrors() || !source.Type().Equals(cty.String) {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Unsuitable value type",
Detail: "Unsuitable value: string required",
Subject: attr.Expr.Range().Ptr(),
})
continue
}
if !source.IsNull() {
pr.Source = source.AsString()
}
case "configuration_aliases":
aliases, valDiags := decodeConfigurationAliases(name, kv.Value)
if valDiags.HasErrors() {
diags = append(diags, valDiags...)
continue
}
pr.ConfigurationAliases = append(pr.ConfigurationAliases, aliases...)
}
reqs[name] = &pr
}
}
return reqs, diags
}
func decodeConfigurationAliases(localName string, value hcl.Expression) ([]ProviderRef, hcl.Diagnostics) {
aliases := make([]ProviderRef, 0)
var diags hcl.Diagnostics
exprs, listDiags := hcl.ExprList(value)
if listDiags.HasErrors() {
diags = append(diags, listDiags...)
return aliases, diags
}
for _, expr := range exprs {
traversal, travDiags := hcl.AbsTraversalForExpr(expr)
if travDiags.HasErrors() {
diags = append(diags, travDiags...)
continue
}
ref, cfgDiags := parseProviderRef(traversal)
if cfgDiags.HasErrors() {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid configuration_aliases value",
Detail: `Configuration aliases can only contain references to local provider configuration names in the format of provider.alias`,
Subject: value.Range().Ptr(),
})
continue
}
if ref.Name != localName {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid configuration_aliases value",
Detail: fmt.Sprintf(`Configuration aliases must be prefixed with the provider name. Expected %q, but found %q.`, localName, ref.Name),
Subject: value.Range().Ptr(),
})
continue
}
aliases = append(aliases, ref)
}
return aliases, diags
}
func parseProviderRef(traversal hcl.Traversal) (ProviderRef, hcl.Diagnostics) {
var diags hcl.Diagnostics
ret := ProviderRef{
Name: traversal.RootName(),
}
if len(traversal) < 2 {
// Just a local name, then.
return ret, diags
}
aliasStep := traversal[1]
switch ts := aliasStep.(type) {
case hcl.TraverseAttr:
ret.Alias = ts.Name
return ret, diags
default:
diags = diags.Append(&hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid provider configuration address",
Detail: "The provider type name must either stand alone or be followed by an alias name separated with a dot.",
Subject: aliasStep.SourceRange().Ptr(),
})
}
if len(traversal) > 2 {
diags = diags.Append(&hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid provider configuration address",
Detail: "Extraneous extra operators after provider configuration address.",
Subject: traversal[2:].SourceRange().Ptr(),
})
}
return ret, diags
}
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