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resource.go
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resource.go
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package configs
import (
"fmt"
"github.com/hashicorp/hcl/v2"
"github.com/hashicorp/hcl/v2/gohcl"
"github.com/hashicorp/hcl/v2/hclsyntax"
hcljson "github.com/hashicorp/hcl/v2/json"
"github.com/snyk/policy-engine/pkg/internal/terraform/addrs"
"github.com/snyk/policy-engine/pkg/internal/terraform/lang"
"github.com/snyk/policy-engine/pkg/internal/terraform/tfdiags"
)
// Resource represents a "resource" or "data" block in a module or file.
type Resource struct {
Mode addrs.ResourceMode
Name string
Type string
Config hcl.Body
Count hcl.Expression
ForEach hcl.Expression
ProviderConfigRef *ProviderConfigRef
Provider addrs.Provider
Preconditions []*CheckRule
Postconditions []*CheckRule
DependsOn []hcl.Traversal
TriggersReplacement []hcl.Expression
// Managed is populated only for Mode = addrs.ManagedResourceMode,
// containing the additional fields that apply to managed resources.
// For all other resource modes, this field is nil.
Managed *ManagedResource
DeclRange hcl.Range
TypeRange hcl.Range
}
// ManagedResource represents a "resource" block in a module or file.
type ManagedResource struct {
Connection *Connection
Provisioners []*Provisioner
CreateBeforeDestroy bool
PreventDestroy bool
IgnoreChanges []hcl.Traversal
IgnoreAllChanges bool
CreateBeforeDestroySet bool
PreventDestroySet bool
}
func (r *Resource) moduleUniqueKey() string {
return r.Addr().String()
}
// Addr returns a resource address for the receiver that is relative to the
// resource's containing module.
func (r *Resource) Addr() addrs.Resource {
return addrs.Resource{
Mode: r.Mode,
Type: r.Type,
Name: r.Name,
}
}
// ProviderConfigAddr returns the address for the provider configuration that
// should be used for this resource. This function returns a default provider
// config addr if an explicit "provider" argument was not provided.
func (r *Resource) ProviderConfigAddr() addrs.LocalProviderConfig {
if r.ProviderConfigRef == nil {
// If no specific "provider" argument is given, we want to look up the
// provider config where the local name matches the implied provider
// from the resource type. This may be different from the resource's
// provider type.
return addrs.LocalProviderConfig{
LocalName: r.Addr().ImpliedProvider(),
}
}
return addrs.LocalProviderConfig{
LocalName: r.ProviderConfigRef.Name,
Alias: r.ProviderConfigRef.Alias,
}
}
// HasCustomConditions returns true if and only if the resource has at least
// one author-specified custom condition.
func (r *Resource) HasCustomConditions() bool {
return len(r.Postconditions) != 0 || len(r.Preconditions) != 0
}
func decodeResourceBlock(block *hcl.Block, override bool) (*Resource, hcl.Diagnostics) {
var diags hcl.Diagnostics
r := &Resource{
Mode: addrs.ManagedResourceMode,
Type: block.Labels[0],
Name: block.Labels[1],
DeclRange: block.DefRange,
TypeRange: block.LabelRanges[0],
Managed: &ManagedResource{},
}
content, remain, moreDiags := block.Body.PartialContent(resourceBlockSchema)
diags = append(diags, moreDiags...)
r.Config = remain
if !hclsyntax.ValidIdentifier(r.Type) {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid resource type name",
Detail: badIdentifierDetail,
Subject: &block.LabelRanges[0],
})
}
if !hclsyntax.ValidIdentifier(r.Name) {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid resource name",
Detail: badIdentifierDetail,
Subject: &block.LabelRanges[1],
})
}
if attr, exists := content.Attributes["count"]; exists {
r.Count = attr.Expr
}
if attr, exists := content.Attributes["for_each"]; exists {
r.ForEach = attr.Expr
// Cannot have count and for_each on the same resource block
if r.Count != nil {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: `Invalid combination of "count" and "for_each"`,
Detail: `The "count" and "for_each" meta-arguments are mutually-exclusive, only one should be used to be explicit about the number of resources to be created.`,
Subject: &attr.NameRange,
})
}
}
if attr, exists := content.Attributes["provider"]; exists {
var providerDiags hcl.Diagnostics
r.ProviderConfigRef, providerDiags = decodeProviderConfigRef(attr.Expr, "provider")
diags = append(diags, providerDiags...)
}
if attr, exists := content.Attributes["depends_on"]; exists {
deps, depsDiags := decodeDependsOn(attr)
diags = append(diags, depsDiags...)
r.DependsOn = append(r.DependsOn, deps...)
}
var seenLifecycle *hcl.Block
var seenConnection *hcl.Block
var seenEscapeBlock *hcl.Block
for _, block := range content.Blocks {
switch block.Type {
case "lifecycle":
if seenLifecycle != nil {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Duplicate lifecycle block",
Detail: fmt.Sprintf("This resource already has a lifecycle block at %s.", seenLifecycle.DefRange),
Subject: &block.DefRange,
})
continue
}
seenLifecycle = block
lcContent, lcDiags := block.Body.Content(resourceLifecycleBlockSchema)
diags = append(diags, lcDiags...)
if attr, exists := lcContent.Attributes["create_before_destroy"]; exists {
valDiags := gohcl.DecodeExpression(attr.Expr, nil, &r.Managed.CreateBeforeDestroy)
diags = append(diags, valDiags...)
r.Managed.CreateBeforeDestroySet = true
}
if attr, exists := lcContent.Attributes["prevent_destroy"]; exists {
valDiags := gohcl.DecodeExpression(attr.Expr, nil, &r.Managed.PreventDestroy)
diags = append(diags, valDiags...)
r.Managed.PreventDestroySet = true
}
if attr, exists := lcContent.Attributes["replace_triggered_by"]; exists {
exprs, hclDiags := decodeReplaceTriggeredBy(attr.Expr)
diags = diags.Extend(hclDiags)
r.TriggersReplacement = append(r.TriggersReplacement, exprs...)
}
if attr, exists := lcContent.Attributes["ignore_changes"]; exists {
// ignore_changes can either be a list of relative traversals
// or it can be just the keyword "all" to ignore changes to this
// resource entirely.
// ignore_changes = [ami, instance_type]
// ignore_changes = all
// We also allow two legacy forms for compatibility with earlier
// versions:
// ignore_changes = ["ami", "instance_type"]
// ignore_changes = ["*"]
kw := hcl.ExprAsKeyword(attr.Expr)
switch {
case kw == "all":
r.Managed.IgnoreAllChanges = true
default:
exprs, listDiags := hcl.ExprList(attr.Expr)
diags = append(diags, listDiags...)
var ignoreAllRange hcl.Range
for _, expr := range exprs {
// our expr might be the literal string "*", which
// we accept as a deprecated way of saying "all".
if shimIsIgnoreChangesStar(expr) {
r.Managed.IgnoreAllChanges = true
ignoreAllRange = expr.Range()
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid ignore_changes wildcard",
Detail: "The [\"*\"] form of ignore_changes wildcard is was deprecated and is now invalid. Use \"ignore_changes = all\" to ignore changes to all attributes.",
Subject: attr.Expr.Range().Ptr(),
})
continue
}
expr, shimDiags := shimTraversalInString(expr, false)
diags = append(diags, shimDiags...)
traversal, travDiags := hcl.RelTraversalForExpr(expr)
diags = append(diags, travDiags...)
if len(traversal) != 0 {
r.Managed.IgnoreChanges = append(r.Managed.IgnoreChanges, traversal)
}
}
if r.Managed.IgnoreAllChanges && len(r.Managed.IgnoreChanges) != 0 {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid ignore_changes ruleset",
Detail: "Cannot mix wildcard string \"*\" with non-wildcard references.",
Subject: &ignoreAllRange,
Context: attr.Expr.Range().Ptr(),
})
}
}
}
for _, block := range lcContent.Blocks {
switch block.Type {
case "precondition", "postcondition":
cr, moreDiags := decodeCheckRuleBlock(block, override)
diags = append(diags, moreDiags...)
moreDiags = cr.validateSelfReferences(block.Type, r.Addr())
diags = append(diags, moreDiags...)
switch block.Type {
case "precondition":
r.Preconditions = append(r.Preconditions, cr)
case "postcondition":
r.Postconditions = append(r.Postconditions, cr)
}
default:
// The cases above should be exhaustive for all block types
// defined in the lifecycle schema, so this shouldn't happen.
panic(fmt.Sprintf("unexpected lifecycle sub-block type %q", block.Type))
}
}
case "connection":
if seenConnection != nil {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Duplicate connection block",
Detail: fmt.Sprintf("This resource already has a connection block at %s.", seenConnection.DefRange),
Subject: &block.DefRange,
})
continue
}
seenConnection = block
r.Managed.Connection = &Connection{
Config: block.Body,
DeclRange: block.DefRange,
}
case "provisioner":
pv, pvDiags := decodeProvisionerBlock(block)
diags = append(diags, pvDiags...)
if pv != nil {
r.Managed.Provisioners = append(r.Managed.Provisioners, pv)
}
case "_":
if seenEscapeBlock != nil {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Duplicate escaping block",
Detail: fmt.Sprintf(
"The special block type \"_\" can be used to force particular arguments to be interpreted as resource-type-specific rather than as meta-arguments, but each resource block can have only one such block. The first escaping block was at %s.",
seenEscapeBlock.DefRange,
),
Subject: &block.DefRange,
})
continue
}
seenEscapeBlock = block
// When there's an escaping block its content merges with the
// existing config we extracted earlier, so later decoding
// will see a blend of both.
r.Config = hcl.MergeBodies([]hcl.Body{r.Config, block.Body})
default:
// Any other block types are ones we've reserved for future use,
// so they get a generic message.
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Reserved block type name in resource block",
Detail: fmt.Sprintf("The block type name %q is reserved for use by Terraform in a future version.", block.Type),
Subject: &block.TypeRange,
})
}
}
// Now we can validate the connection block references if there are any destroy provisioners.
// TODO: should we eliminate standalone connection blocks?
if r.Managed.Connection != nil {
for _, p := range r.Managed.Provisioners {
if p.When == ProvisionerWhenDestroy {
diags = append(diags, onlySelfRefs(r.Managed.Connection.Config)...)
break
}
}
}
return r, diags
}
func decodeDataBlock(block *hcl.Block, override bool) (*Resource, hcl.Diagnostics) {
var diags hcl.Diagnostics
r := &Resource{
Mode: addrs.DataResourceMode,
Type: block.Labels[0],
Name: block.Labels[1],
DeclRange: block.DefRange,
TypeRange: block.LabelRanges[0],
}
content, remain, moreDiags := block.Body.PartialContent(dataBlockSchema)
diags = append(diags, moreDiags...)
r.Config = remain
if !hclsyntax.ValidIdentifier(r.Type) {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid data source name",
Detail: badIdentifierDetail,
Subject: &block.LabelRanges[0],
})
}
if !hclsyntax.ValidIdentifier(r.Name) {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid data resource name",
Detail: badIdentifierDetail,
Subject: &block.LabelRanges[1],
})
}
if attr, exists := content.Attributes["count"]; exists {
r.Count = attr.Expr
}
if attr, exists := content.Attributes["for_each"]; exists {
r.ForEach = attr.Expr
// Cannot have count and for_each on the same data block
if r.Count != nil {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: `Invalid combination of "count" and "for_each"`,
Detail: `The "count" and "for_each" meta-arguments are mutually-exclusive, only one should be used to be explicit about the number of resources to be created.`,
Subject: &attr.NameRange,
})
}
}
if attr, exists := content.Attributes["provider"]; exists {
var providerDiags hcl.Diagnostics
r.ProviderConfigRef, providerDiags = decodeProviderConfigRef(attr.Expr, "provider")
diags = append(diags, providerDiags...)
}
if attr, exists := content.Attributes["depends_on"]; exists {
deps, depsDiags := decodeDependsOn(attr)
diags = append(diags, depsDiags...)
r.DependsOn = append(r.DependsOn, deps...)
}
var seenEscapeBlock *hcl.Block
var seenLifecycle *hcl.Block
for _, block := range content.Blocks {
switch block.Type {
case "_":
if seenEscapeBlock != nil {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Duplicate escaping block",
Detail: fmt.Sprintf(
"The special block type \"_\" can be used to force particular arguments to be interpreted as resource-type-specific rather than as meta-arguments, but each data block can have only one such block. The first escaping block was at %s.",
seenEscapeBlock.DefRange,
),
Subject: &block.DefRange,
})
continue
}
seenEscapeBlock = block
// When there's an escaping block its content merges with the
// existing config we extracted earlier, so later decoding
// will see a blend of both.
r.Config = hcl.MergeBodies([]hcl.Body{r.Config, block.Body})
case "lifecycle":
if seenLifecycle != nil {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Duplicate lifecycle block",
Detail: fmt.Sprintf("This resource already has a lifecycle block at %s.", seenLifecycle.DefRange),
Subject: block.DefRange.Ptr(),
})
continue
}
seenLifecycle = block
lcContent, lcDiags := block.Body.Content(resourceLifecycleBlockSchema)
diags = append(diags, lcDiags...)
// All of the attributes defined for resource lifecycle are for
// managed resources only, so we can emit a common error message
// for any given attributes that HCL accepted.
for name, attr := range lcContent.Attributes {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid data resource lifecycle argument",
Detail: fmt.Sprintf("The lifecycle argument %q is defined only for managed resources (\"resource\" blocks), and is not valid for data resources.", name),
Subject: attr.NameRange.Ptr(),
})
}
for _, block := range lcContent.Blocks {
switch block.Type {
case "precondition", "postcondition":
cr, moreDiags := decodeCheckRuleBlock(block, override)
diags = append(diags, moreDiags...)
moreDiags = cr.validateSelfReferences(block.Type, r.Addr())
diags = append(diags, moreDiags...)
switch block.Type {
case "precondition":
r.Preconditions = append(r.Preconditions, cr)
case "postcondition":
r.Postconditions = append(r.Postconditions, cr)
}
default:
// The cases above should be exhaustive for all block types
// defined in the lifecycle schema, so this shouldn't happen.
panic(fmt.Sprintf("unexpected lifecycle sub-block type %q", block.Type))
}
}
default:
// Any other block types are ones we're reserving for future use,
// but don't have any defined meaning today.
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Reserved block type name in data block",
Detail: fmt.Sprintf("The block type name %q is reserved for use by Terraform in a future version.", block.Type),
Subject: block.TypeRange.Ptr(),
})
}
}
return r, diags
}
// decodeReplaceTriggeredBy decodes and does basic validation of the
// replace_triggered_by expressions, ensuring they only contains references to
// a single resource, and the only extra variables are count.index or each.key.
func decodeReplaceTriggeredBy(expr hcl.Expression) ([]hcl.Expression, hcl.Diagnostics) {
// Since we are manually parsing the replace_triggered_by argument, we
// need to specially handle json configs, in which case the values will
// be json strings rather than hcl. To simplify parsing however we will
// decode the individual list elements, rather than the entire expression.
isJSON := hcljson.IsJSONExpression(expr)
exprs, diags := hcl.ExprList(expr)
for i, expr := range exprs {
if isJSON {
// We can abuse the hcl json api and rely on the fact that calling
// Value on a json expression with no EvalContext will return the
// raw string. We can then parse that as normal hcl syntax, and
// continue with the decoding.
v, ds := expr.Value(nil)
diags = diags.Extend(ds)
if diags.HasErrors() {
continue
}
expr, ds = hclsyntax.ParseExpression([]byte(v.AsString()), "", expr.Range().Start)
diags = diags.Extend(ds)
if diags.HasErrors() {
continue
}
// make sure to swap out the expression we're returning too
exprs[i] = expr
}
refs, refDiags := lang.ReferencesInExpr(expr)
for _, diag := range refDiags {
severity := hcl.DiagError
if diag.Severity() == tfdiags.Warning {
severity = hcl.DiagWarning
}
desc := diag.Description()
diags = append(diags, &hcl.Diagnostic{
Severity: severity,
Summary: desc.Summary,
Detail: desc.Detail,
Subject: expr.Range().Ptr(),
})
}
if refDiags.HasErrors() {
continue
}
resourceCount := 0
for _, ref := range refs {
switch sub := ref.Subject.(type) {
case addrs.Resource, addrs.ResourceInstance:
resourceCount++
case addrs.ForEachAttr:
if sub.Name != "key" {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid each reference in replace_triggered_by expression",
Detail: "Only each.key may be used in replace_triggered_by.",
Subject: expr.Range().Ptr(),
})
}
case addrs.CountAttr:
if sub.Name != "index" {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid count reference in replace_triggered_by expression",
Detail: "Only count.index may be used in replace_triggered_by.",
Subject: expr.Range().Ptr(),
})
}
default:
// everything else should be simple traversals
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid reference in replace_triggered_by expression",
Detail: "Only resources, count.index, and each.key may be used in replace_triggered_by.",
Subject: expr.Range().Ptr(),
})
}
}
switch {
case resourceCount == 0:
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid replace_triggered_by expression",
Detail: "Missing resource reference in replace_triggered_by expression.",
Subject: expr.Range().Ptr(),
})
case resourceCount > 1:
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid replace_triggered_by expression",
Detail: "Multiple resource references in replace_triggered_by expression.",
Subject: expr.Range().Ptr(),
})
}
}
return exprs, diags
}
type ProviderConfigRef struct {
Name string
NameRange hcl.Range
Alias string
AliasRange *hcl.Range // nil if alias not set
// TODO: this may not be set in some cases, so it is not yet suitable for
// use outside of this package. We currently only use it for internal
// validation, but once we verify that this can be set in all cases, we can
// export this so providers don't need to be re-resolved.
// This same field is also added to the Provider struct.
providerType addrs.Provider
}
func decodeProviderConfigRef(expr hcl.Expression, argName string) (*ProviderConfigRef, hcl.Diagnostics) {
var diags hcl.Diagnostics
var shimDiags hcl.Diagnostics
expr, shimDiags = shimTraversalInString(expr, false)
diags = append(diags, shimDiags...)
traversal, travDiags := hcl.AbsTraversalForExpr(expr)
// AbsTraversalForExpr produces only generic errors, so we'll discard
// the errors given and produce our own with extra context. If we didn't
// get any errors then we might still have warnings, though.
if !travDiags.HasErrors() {
diags = append(diags, travDiags...)
}
if len(traversal) < 1 || len(traversal) > 2 {
// A provider reference was given as a string literal in the legacy
// configuration language and there are lots of examples out there
// showing that usage, so we'll sniff for that situation here and
// produce a specialized error message for it to help users find
// the new correct form.
if exprIsNativeQuotedString(expr) {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid provider configuration reference",
Detail: "A provider configuration reference must not be given in quotes.",
Subject: expr.Range().Ptr(),
})
return nil, diags
}
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid provider configuration reference",
Detail: fmt.Sprintf("The %s argument requires a provider type name, optionally followed by a period and then a configuration alias.", argName),
Subject: expr.Range().Ptr(),
})
return nil, diags
}
// verify that the provider local name is normalized
name := traversal.RootName()
nameDiags := checkProviderNameNormalized(name, traversal[0].SourceRange())
diags = append(diags, nameDiags...)
if diags.HasErrors() {
return nil, diags
}
ret := &ProviderConfigRef{
Name: name,
NameRange: traversal[0].SourceRange(),
}
if len(traversal) > 1 {
aliasStep, ok := traversal[1].(hcl.TraverseAttr)
if !ok {
diags = append(diags, &hcl.Diagnostic{
Severity: hcl.DiagError,
Summary: "Invalid provider configuration reference",
Detail: "Provider name must either stand alone or be followed by a period and then a configuration alias.",
Subject: traversal[1].SourceRange().Ptr(),
})
return ret, diags
}
ret.Alias = aliasStep.Name
ret.AliasRange = aliasStep.SourceRange().Ptr()
}
return ret, diags
}
// Addr returns the provider config address corresponding to the receiving
// config reference.
//
// This is a trivial conversion, essentially just discarding the source
// location information and keeping just the addressing information.
func (r *ProviderConfigRef) Addr() addrs.LocalProviderConfig {
return addrs.LocalProviderConfig{
LocalName: r.Name,
Alias: r.Alias,
}
}
func (r *ProviderConfigRef) String() string {
if r == nil {
return "<nil>"
}
if r.Alias != "" {
return fmt.Sprintf("%s.%s", r.Name, r.Alias)
}
return r.Name
}
var commonResourceAttributes = []hcl.AttributeSchema{
{
Name: "count",
},
{
Name: "for_each",
},
{
Name: "provider",
},
{
Name: "depends_on",
},
}
var resourceBlockSchema = &hcl.BodySchema{
Attributes: commonResourceAttributes,
Blocks: []hcl.BlockHeaderSchema{
{Type: "locals"}, // reserved for future use
{Type: "lifecycle"},
{Type: "connection"},
{Type: "provisioner", LabelNames: []string{"type"}},
{Type: "_"}, // meta-argument escaping block
},
}
var dataBlockSchema = &hcl.BodySchema{
Attributes: commonResourceAttributes,
Blocks: []hcl.BlockHeaderSchema{
{Type: "lifecycle"},
{Type: "locals"}, // reserved for future use
{Type: "_"}, // meta-argument escaping block
},
}
var resourceLifecycleBlockSchema = &hcl.BodySchema{
// We tell HCL that these elements are all valid for both "resource"
// and "data" lifecycle blocks, but the rules are actually more restrictive
// than that. We deal with that after decoding so that we can return
// more specific error messages than HCL would typically return itself.
Attributes: []hcl.AttributeSchema{
{
Name: "create_before_destroy",
},
{
Name: "prevent_destroy",
},
{
Name: "ignore_changes",
},
{
Name: "replace_triggered_by",
},
},
Blocks: []hcl.BlockHeaderSchema{
{Type: "precondition"},
{Type: "postcondition"},
},
}