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Some refactoring to reduce the size of main.go in preparation of adding OTEL Tracing instrumentation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| package protect | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "errors" | ||
| "github.com/ldebruijn/graphql-protect/internal/app/config" | ||
| "github.com/ldebruijn/graphql-protect/internal/business/aliases" | ||
| "github.com/ldebruijn/graphql-protect/internal/business/batch" | ||
| "github.com/ldebruijn/graphql-protect/internal/business/enforce_post" | ||
| "github.com/ldebruijn/graphql-protect/internal/business/gql" | ||
| "github.com/ldebruijn/graphql-protect/internal/business/max_depth" | ||
| "github.com/ldebruijn/graphql-protect/internal/business/persisted_operations" | ||
| "github.com/ldebruijn/graphql-protect/internal/business/schema" | ||
| "github.com/ldebruijn/graphql-protect/internal/business/tokens" | ||
| "github.com/vektah/gqlparser/v2/ast" | ||
| "github.com/vektah/gqlparser/v2/gqlerror" | ||
| "github.com/vektah/gqlparser/v2/parser" | ||
| "github.com/vektah/gqlparser/v2/validator" | ||
| "log/slog" | ||
| "net/http" | ||
| ) | ||
|
|
||
| var ( | ||
| ErrRedacted = errors.New("error(s) redacted") | ||
| ) | ||
|
|
||
| type GraphQLProtect struct { | ||
| log *slog.Logger | ||
| cfg *config.Config | ||
| po *persisted_operations.PersistedOperationsHandler | ||
| schema *schema.Provider | ||
| tokens *tokens.MaxTokensRule | ||
| maxBatch *batch.MaxBatchRule | ||
| next http.Handler | ||
| preFilterChain func(handler http.Handler) http.Handler | ||
| } | ||
|
|
||
| func NewGraphQLProtect(log *slog.Logger, cfg *config.Config, po *persisted_operations.PersistedOperationsHandler, schema *schema.Provider, upstreamHandler http.Handler) (*GraphQLProtect, error) { | ||
| aliases.NewMaxAliasesRule(cfg.MaxAliases) | ||
| max_depth.NewMaxDepthRule(cfg.MaxDepth) | ||
| maxBatch, err := batch.NewMaxBatch(cfg.MaxBatch) | ||
| if err != nil { | ||
| log.Warn("Error initializing maximum batch protection", err) | ||
| } | ||
|
|
||
| disableMethod := enforce_post.EnforcePostMethod(cfg.EnforcePost) | ||
|
|
||
| return &GraphQLProtect{ | ||
| log: log, | ||
| cfg: cfg, | ||
| po: po, | ||
| schema: schema, | ||
| tokens: tokens.MaxTokens(cfg.MaxTokens), | ||
| maxBatch: maxBatch, | ||
| preFilterChain: func(next http.Handler) http.Handler { | ||
| return disableMethod(po.Execute(next)) | ||
| }, | ||
| next: upstreamHandler, | ||
| }, nil | ||
| } | ||
|
|
||
| func (p *GraphQLProtect) ServeHTTP(w http.ResponseWriter, r *http.Request) { | ||
| p.preFilterChain(http.HandlerFunc(p.handle)).ServeHTTP(w, r) | ||
| } | ||
|
|
||
| func (p *GraphQLProtect) handle(w http.ResponseWriter, r *http.Request) { | ||
| errs := p.validateRequest(r) | ||
|
|
||
| if len(errs) > 0 { | ||
| if p.cfg.ObfuscateValidationErrors { | ||
| errs = gqlerror.List{gqlerror.Wrap(ErrRedacted)} | ||
| } | ||
|
|
||
| response := map[string]interface{}{ | ||
| "data": nil, | ||
| "errors": errs, | ||
| } | ||
|
|
||
| w.Header().Set("Content-Type", "application/json") | ||
| err := json.NewEncoder(w).Encode(response) | ||
| if err != nil { | ||
| p.log.Error("could not encode error", "err", err) | ||
| } | ||
| return | ||
| } | ||
|
|
||
| p.next.ServeHTTP(w, r) | ||
| } | ||
|
|
||
| func (p *GraphQLProtect) validateRequest(r *http.Request) gqlerror.List { | ||
| payload, err := gql.ParseRequestPayload(r) | ||
| if err != nil { | ||
| return gqlerror.List{gqlerror.Wrap(err)} | ||
| } | ||
|
|
||
| var errs gqlerror.List | ||
|
|
||
| err = p.maxBatch.Validate(payload) | ||
| if err != nil { | ||
| errs = append(errs, gqlerror.Wrap(err)) | ||
| } | ||
|
|
||
| if err != nil { | ||
| return errs | ||
| } | ||
|
|
||
| // only process the rest if no error yet | ||
| if err == nil { | ||
| for _, data := range payload { | ||
| validationErrors := p.validateQuery(data) | ||
| if len(validationErrors) > 0 { | ||
| errs = append(errs, validationErrors...) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return errs | ||
| } | ||
|
|
||
| func (p *GraphQLProtect) validateQuery(data gql.RequestData) gqlerror.List { | ||
| operationSource := &ast.Source{ | ||
| Input: data.Query, | ||
| } | ||
|
|
||
| err := p.tokens.Validate(operationSource) | ||
| if err != nil { | ||
| return gqlerror.List{gqlerror.Wrap(err)} | ||
| } | ||
|
|
||
| query, err := parser.ParseQuery(operationSource) | ||
| if err != nil { | ||
| return gqlerror.List{gqlerror.Wrap(err)} | ||
| } | ||
|
|
||
| return validator.Validate(p.schema.Get(), query) | ||
| } |
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