simstudioai
diff --git a/‎apps/sim/executor/handlers/condition/condition-handler.test.ts‎
Lines changed: 101 additions & 0 deletions b/‎apps/sim/executor/handlers/condition/condition-handler.test.ts‎
Lines changed: 101 additions & 0 deletions
diff --git a/‎apps/sim/executor/handlers/condition/condition-handler.ts‎
Lines changed: 60 additions & 7 deletions b/‎apps/sim/executor/handlers/condition/condition-handler.ts‎
Lines changed: 60 additions & 7 deletions
diff --git a/‎apps/sim/executor/utils/code-formatting.ts‎
Lines changed: 33 additions & 0 deletions b/‎apps/sim/executor/utils/code-formatting.ts‎
Lines changed: 33 additions & 0 deletions
@@ -202,6 +202,107 @@ describe('ConditionBlockHandler', () => {
     )
   })
 
+  it('mounts only the secrets the condition names', async () => {
+    mockExecuteTool.mockResolvedValueOnce(matchedAt(0))
+
+    const conditions = [
+      { id: 'cond1', title: 'if', value: '"{{ROUTE_KEY}}" === "beta"' },
+      { id: 'else1', title: 'else', value: '' },
+    ]
+
+    await handler.execute(mockContext, mockBlock, { conditions: JSON.stringify(conditions) })
+
+    const [, toolParams] = mockExecuteTool.mock.calls[0]
+    expect(toolParams.secretScope).toBe('selected')
+    expect(toolParams.mountedSecrets).toEqual(['ROUTE_KEY'])
+  })
+
+  it('denies every secret to a condition that names none', async () => {
+    mockExecuteTool.mockResolvedValueOnce(matchedAt(0))
+
+    const conditions = [
+      { id: 'cond1', title: 'if', value: 'context.value > 5' },
+      { id: 'else1', title: 'else', value: '' },
+    ]
+
+    await handler.execute(mockContext, mockBlock, { conditions: JSON.stringify(conditions) })
+
+    const [, toolParams] = mockExecuteTool.mock.calls[0]
+    expect(toolParams.secretScope).toBe('selected')
+    expect(toolParams.mountedSecrets).toEqual([])
+  })
+
+  it('does not let resolved data decide which secrets the sandbox holds', async () => {
+    // The script carries the source block's output as data. Reading that data for either
+    // signal would let a caller pick what materializes beside it — the whole map by naming
+    // the global, or one secret by naming its placeholder.
+    mockExecuteTool.mockResolvedValueOnce(matchedAt(0))
+    mockContext.blockStates.set('source-block-1', {
+      output: { text: 'environmentVariables.OPENAI_API_KEY {{OPENAI_API_KEY}}' },
+      executed: true,
+      executionTime: 0,
+    } as BlockState)
+
+    const conditions = [
+      { id: 'cond1', title: 'if', value: `context.text === 'x'` },
+      { id: 'else1', title: 'else', value: '' },
+    ]
+
+    await handler.execute(mockContext, mockBlock, { conditions: JSON.stringify(conditions) })
+
+    const [, toolParams] = mockExecuteTool.mock.calls[0]
+    expect(toolParams.code).toContain('{{OPENAI_API_KEY}}')
+    expect(toolParams.secretScope).toBe('selected')
+    expect(toolParams.mountedSecrets).toEqual([])
+  })
+
+  it('trusts the resolver record over the word appearing in a resolved expression', async () => {
+    // The resolver saw the author's text before any value was inlined; the expression by now
+    // carries trigger data, where the same word means nothing.
+    mockExecuteTool.mockResolvedValueOnce(matchedAt(0))
+
+    const conditions = [
+      {
+        id: 'cond1',
+        title: 'if',
+        value: `'environmentVariables.OPENAI_API_KEY' === 'x'`,
+        _readsEnvironmentVariables: false,
+      },
+      { id: 'else1', title: 'else', value: '' },
+    ]
+
+    await handler.execute(mockContext, mockBlock, { conditions: JSON.stringify(conditions) })
+
+    const [, toolParams] = mockExecuteTool.mock.calls[0]
+    expect(toolParams.secretScope).toBe('selected')
+    expect(toolParams.mountedSecrets).toEqual([])
+  })
+
+  it('keeps the whole environment for a condition that reads the environment directly', async () => {
+    // Every shape an expression can reach the map through, including the ones a member-access
+    // pattern would miss — narrowing one of those would route the run silently.
+    const reads = [
+      'environmentVariables.ROUTE_KEY === "beta"',
+      'environmentVariables["ROUTE_KEY"] === "beta"',
+      'environmentVariables?.ROUTE_KEY === "beta"',
+      'Object.keys(environmentVariables).length > 0',
+    ]
+
+    for (const value of reads) {
+      mockExecuteTool.mockReset()
+      mockExecuteTool.mockResolvedValueOnce(matchedAt(0))
+      const conditions = [
+        { id: 'cond1', title: 'if', value },
+        { id: 'else1', title: 'else', value: '' },
+      ]
+
+      await handler.execute(mockContext, mockBlock, { conditions: JSON.stringify(conditions) })
+
+      const [, toolParams] = mockExecuteTool.mock.calls[0]
+      expect(toolParams.secretScope, `condition ${value}`).toBe('all')
+    }
+  })
+
   it('should never forward collected block outputs in the request body', async () => {
     mockCollectBlockData.mockReturnValueOnce({
       blockData: { 'huge-block': { payload: 'x'.repeat(1024) } },
 
@@ -10,12 +10,14 @@ import type { BlockOutput } from '@/blocks/types'
 import { BlockType, DEFAULTS, EDGE } from '@/executor/constants'
 import type { BlockHandler, ExecutionContext } from '@/executor/types'
 import { collectBlockData } from '@/executor/utils/block-data'
+import { createEnvVarPattern } from '@/executor/utils/reference-validation'
 import {
   buildBranchNodeId,
   extractBaseBlockId,
   extractBranchIndex,
   isBranchNodeId,
 } from '@/executor/utils/subflow-utils'
+import { CONDITION_READS_ENVIRONMENT_KEY } from '@/executor/variables/resolver'
 import type { SerializedBlock } from '@/serializer/types'
 import { executeTool } from '@/tools'
 import type { ToolResponse } from '@/tools/types'
@@ -28,6 +30,8 @@ interface ConditionEntry {
   id: string
   title: string
   value: string
+  /** Set by the resolver from the author's pre-resolution expression. */
+  [CONDITION_READS_ENVIRONMENT_KEY]?: boolean
 }
 
 /** Verdict for a whole condition list evaluated in one function execution. */
@@ -88,6 +92,50 @@ function buildConditionScript(expressions: string[], evalContext: Record<string,
   ].join('\n')
 }
 
+/**
+ * Narrows the secrets a condition evaluation can read to the ones its script names.
+ *
+ * A condition reaches a secret by writing `{{NAME}}`, which the execution-boundary compiler
+ * binds. Nothing else in the script needs the workspace's other secrets, so handing the
+ * sandbox the full environment only widens what a future defect in this path could reach —
+ * the whole map was readable as the `environmentVariables` global.
+ *
+ * Neither signal is read from the built script, which also carries the source block's output as
+ * data. Reading that data would let it decide what the sandbox holds — a payload containing
+ * `{{SECRET}}` would mount that secret and have the compiler expand it beside the payload.
+ * Placeholders are therefore read from the expressions, which is where every legitimate route
+ * to a secret passes, including a workflow variable holding `{{NAME}}`: the resolver inlines
+ * that value into the expression before this runs.
+ *
+ * A direct read of the environment map is not read from the resolved expression either, for the
+ * same reason one step further in: resolved data is quoted inside it, so a payload containing
+ * the word would be indistinguishable from the author reaching for the map. The resolver
+ * records the answer from the author's pre-resolution text instead. When that record is absent
+ * — a caller that did not resolve through it — the expression is scanned as a fallback, because
+ * narrowing a read this missed would route the run down a branch the author did not write,
+ * silently, while matching too widely only costs the narrowing.
+ */
+function scopeConditionSecrets(conditions: ConditionEntry[]): {
+  secretScope: 'all' | 'selected'
+  mountedSecrets: string[]
+} {
+  const readsEnvironment = conditions.some((condition) => {
+    const recorded = condition[CONDITION_READS_ENVIRONMENT_KEY]
+    return recorded ?? /\benvironmentVariables\b/.test(condition.value)
+  })
+  if (readsEnvironment) {
+    return { secretScope: 'all', mountedSecrets: [] }
+  }
+
+  const named = new Set<string>()
+  for (const condition of conditions) {
+    for (const match of String(condition.value ?? '').matchAll(createEnvVarPattern())) {
+      named.add(String(match[1]).trim())
+    }
+  }
+  return { secretScope: 'selected', mountedSecrets: [...named] }
+}
+
 /**
  * Runs condition code through the shared function execution boundary.
  *
@@ -100,15 +148,19 @@ function buildConditionScript(expressions: string[], evalContext: Record<string,
 async function runConditionCode(
   ctx: ExecutionContext,
   code: string,
+  conditions: ConditionEntry[],
   currentNodeId?: string
 ): Promise<ToolResponse> {
   const { blockNameMapping, blockOutputSchemas } = collectBlockData(ctx, currentNodeId)
+  const { secretScope, mountedSecrets } = scopeConditionSecrets(conditions)
 
   return executeTool(
     'function_execute',
     {
       code,
       timeout: CONDITION_TIMEOUT_MS,
+      secretScope,
+      mountedSecrets,
       envVars: normalizeStringRecord(ctx.environmentVariables),
       workflowVariables: normalizeWorkflowVariables(ctx.workflowVariables),
       blockData: {},
@@ -143,13 +195,15 @@ function isTimeoutFailure(error: string | undefined): boolean {
 /** Evaluates the whole condition list in a single function execution. */
 async function evaluateConditionList(
   ctx: ExecutionContext,
-  expressions: string[],
+  conditions: ConditionEntry[],
   evalContext: Record<string, unknown>,
   currentNodeId?: string
 ): Promise<ConditionEvaluation> {
+  const expressions = conditions.map((condition) => String(condition.value || ''))
   const result = await runConditionCode(
     ctx,
     buildConditionScript(expressions, evalContext),
+    conditions,
     currentNodeId
   )
 
@@ -229,12 +283,13 @@ async function evaluateConditionList(
  */
 async function evaluateSingleCondition(
   ctx: ExecutionContext,
-  expression: string,
+  condition: ConditionEntry,
   evalContext: Record<string, unknown>,
   currentNodeId?: string
 ): Promise<boolean> {
+  const expression = String(condition.value || '')
   const code = `const context = ${JSON.stringify(evalContext)};\nreturn ${buildBooleanTest(expression)}`
-  const result = await runConditionCode(ctx, code, currentNodeId)
+  const result = await runConditionCode(ctx, code, [condition], currentNodeId)
 
   if (!result.success) {
     if (result.retryable === false) {
@@ -418,11 +473,9 @@ export class ConditionBlockHandler implements BlockHandler {
   ): Promise<ConditionEntry | null> {
     if (conditions.length === 0) return null
 
-    const expressions = conditions.map((condition) => String(condition.value || ''))
-
     let evaluation: ConditionEvaluation
     try {
-      evaluation = await evaluateConditionList(ctx, expressions, evalContext, currentNodeId)
+      evaluation = await evaluateConditionList(ctx, conditions, evalContext, currentNodeId)
     } catch (error) {
       if (isNonRetryableExecutionError(error)) throw error
       evaluation = {
@@ -474,7 +527,7 @@ export class ConditionBlockHandler implements BlockHandler {
       try {
         const conditionMet = await evaluateSingleCondition(
           ctx,
-          String(condition.value || ''),
+          condition,
           evalContext,
           currentNodeId
         )
 
@@ -46,3 +46,36 @@ export function formatLiteralForCode(value: unknown, language: 'javascript' | 'p
   }
   return JSON.stringify(value)
 }
+
+/**
+ * Escapes text so it cannot terminate whatever JavaScript literal it is spliced into.
+ *
+ * Condition expressions are user-authored JavaScript into which resolved references are
+ * inlined as source, so the author's quoting — not this module's — decides which string
+ * context the value lands in. Escaping only the quote the emitted literal opens leaves
+ * `"`, a backtick, `${`, and `/` live, and `"<start.input>".includes('urgent')` then lets
+ * trigger data close the author's string and run as code in the condition sandbox.
+ *
+ * So every terminator of every JavaScript string context is escaped, not just the one the
+ * emitted literal opens. `\"`, `` \` ``, `\$`, and `\/` are identity escapes in JavaScript,
+ * so the value a condition compares is byte-identical to what it was before — this is a
+ * syntax guard, not a value transform.
+ *
+ * JavaScript only: `\$`, `` \` `` and `\/` are not identity escapes in Python, where they
+ * would change the value. Code blocks bind their values as runtime context variables
+ * instead of splicing them, which is why they need no escaping in any language.
+ */
+export function escapeInertStringContent(value: string): string {
+  return value
+    .replace(/\\/g, '\\\\')
+    .replace(/['"`$/]/g, '\\$&')
+    .replace(/\n/g, '\\n')
+    .replace(/\r/g, '\\r')
+    .replace(/\u2028/g, '\\u2028')
+    .replace(/\u2029/g, '\\u2029')
+}
+
+/** Wraps {@link escapeInertStringContent} output as a complete JavaScript string literal. */
+export function formatInertStringLiteral(value: string, quote: '"' | "'" = "'"): string {
+  return `${quote}${escapeInertStringContent(value)}${quote}`
+}